The TRUE tire size thread- Mtbr.com
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  1. #1
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    The TRUE tire size thread

    ohh no, here we go again, not another tire thread

    I'd really like all the info in one place, so lets see what we can gather here

    Post your actual inside bead to bead measurements with tires lying flat so help us out filling in missing data where we can

    here's what I've gathered from other threads and this one, if I'm missing any tires and you have the info, post it up

    all collected data is in black, if measurements came in together I kept them on the same line

    I added averages and estimates so we can see the predictions and the actuals

    Rim sizes added as well, no I don't care if there's a 44 and a 102 or whatever, this is enough

    Weights added, these are averages or published weights, tires fluctuate by up to 100g, usually 50 one way or the other from the numbers in the chart

    tire sizes.pdf
    Last edited by TitanofChaos; 03-19-2015 at 05:59 AM.
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  2. #2
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    [QUOTE=TitanofChaos;10933399]ohh no, here we go again, not another tire thread

    Post your actual inside bead to bead measurements with tires lying flat so help us out filling in missing data where we can

    Could you provide a picture demonstrating how this should look so we can be consistent?

  3. #3
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    Quote Originally Posted by genefruit View Post
    Could you provide a picture demonstrating how this should look so we can be consistent?
    The TRUE tire size thread-bead.png

    you want this measurement, bead edge to bead edge but from the inside, tire tread flat on the table
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  4. #4
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    But sir what if we lack the techno for such things?

  5. #5
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    ...by the way you can get a pretty decent approximation of mounted casing width by simply adding rim width to the casing's flat width and dividing by 3.14. I tested it with a few of the tires on the above table and it came reasonably closed to the measured widths that I have seen for those tires when mounted.
    --Peace

  6. #6
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    Quote Originally Posted by Lars_D View Post
    ...by the way you can get a pretty decent approximation of mounted casing width by simply adding rim width to the casing's flat width and dividing by 3.14. I tested it with a few of the tires on the above table and it came reasonably closed to the measured widths that I have seen for those tires when mounted.
    Thanks for the tip, this plus surly's tire spec sheet looks like it got really close for all of their tires, I added them above
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  7. #7
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    I'm no mathematician, but does this system take into account any variances in sidewall height? Or is sidewall height standardized among all fat tires?

  8. #8
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    I'm not sure how useful this is. My bfl rubbed the inside of my 907 fork. My snowshoe is nowhere even close. Both at 12 psi on a 90 mm uma.

    And you have an identical bead to bead width on both tires.
    So what "true size" do you hope to get from this?
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  9. #9
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    Quote Originally Posted by thickfog View Post
    I'm not sure how useful this is. My bfl rubbed the inside of my 907 fork. My snowshoe is nowhere even close. Both at 12 psi on a 90 mm uma.

    And you have an identical bead to bead width on both tires.
    So what "true size" do you hope to get from this?
    Sent from my XT1060 using Tapatalk
    depends where you get the info, I posted what I think is better info from surly's site
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  10. #10
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    Re: The TRUE tire size thread

    Quote Originally Posted by TitanofChaos View Post
    depends where you get the info, I posted what I think is better info from surly's site
    I got my own tire width info with my own actual experience. I'm not sure what you are trying to accomplish. Is this to determine what an actual mounted width would be? Or approx?

    I'll measure my bfl, larry and snowshoe in a bit to contribute.

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  11. #11
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    238 Big Fat Larry lightweight casing.

    233 Snowshoe 4.7

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  12. #12
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    Quote Originally Posted by thickfog View Post
    I got my own tire width info with my own actual experience. I'm not sure what you are trying to accomplish. Is this to determine what an actual mounted width would be? Or approx?

    I'll measure my bfl, larry and snowshoe in a bit to contribute.

    Sent from my XT1060 using Tapatalk
    I'm only attempting to estimate mounted sizes for the 3 surly rim sizes and somewhat demystify the tire size confusion, manufacturer tire sizes obviously don't mean much as they all measure their tires on different rims at different PSI, some are broken in or stretched and some brand new

    I understand that there will be variations in every tire produced, we see 20-50 gram weight changes in a stack of the same tire so I don't assume anything here is 100% accurate

    I'm just a geek about numbers and data
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  13. #13
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    Ok. I added mine. Hope that helps.

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  14. #14
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    Quote Originally Posted by TitanofChaos View Post
    I'm only attempting to estimate mounted sizes for the 3 surly rim sizes and somewhat demystify the tire size confusion, manufacturer tire sizes obviously don't mean much as they all measure their tires on different rims at different PSI, some are broken in or stretched and some brand new

    I understand that there will be variations in every tire produced, we see 20-50 gram weight changes in a stack of the same tire so I don't assume anything here is 100% accurate

    I'm just a geek about numbers and data
    I appreciate your efforts and others will too.

  15. #15
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    Bud & Lou are actually labeled as 4.8... not sure where the 4.7 came from.
    ...Be careful what you're looking at because it might be looking back...

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    OP, thanks for taking the time to compile this. It was interesting to study the numbers and compare the differences between the smallest rim and tire combo vs. the largest. 30mm or just over an inch difference from one extreme to the other sure puts things in perspective. As a side note, the range in size between like-sized car tire is also significant. We just replaced one set of 225/45/17's with another set of 225/45/17's from a different manufacturer, and the new ones are noticeably larger, so I doubt the small-potatoes fat bike industry will ever be consistent.

  17. #17
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    Edit:
    Morning brain fart.

  18. #18
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    Nice Idea, thanks. Maybe add a couple of more columns. Uma 70mm and 90mm.

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  19. #19
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    Quote Originally Posted by shoo View Post
    Nice Idea, thanks. Maybe add a couple of more columns. Uma 70mm and 90mm.

    Steven
    It'd also be cool to add us little guys that run 47mm-50mm (Schlick Northpaw, Surly Rabbit Hole 26", etc.)
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  20. #20
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    Just measured my Snowshoe on a 80mm RD. 96mm wide at the case, 85mm at tread blocks

  21. #21
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    Quote Originally Posted by duggus View Post
    Bud & Lou are actually labeled as 4.8... not sure where the 4.7 came from.
    this http://surlybikes.com//uploads/downl...Geometries.pdf
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  22. #22
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    Vee8 (new, unmounted): 230mm

  23. #23
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    Any chance of putting another column on there with the tyre weights ? I keep looking for it.

    cheers
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  24. #24
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    Quote Originally Posted by ozzybmx View Post
    Any chance of putting another column on there with the tyre weights ? I keep looking for it.

    cheers
    Done
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  25. #25
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    Cheers... now when I go "hmmm nice width" the weight weenie part of my brain looks at the new column and dismisses it as too heavy.

    I wonder what my bald buds tip the scales at.
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  26. #26
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    measured some missions last night
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  27. #27
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    More measuring, added a sterling bead length and BFL bead length and size on uma 70
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  28. #28
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    This review of the 45nrth Dillinger 5 has a bead to bead measurement of 245 mm.

    45NRTH Dillinger 5 – Six Week Test Ride | FAT-BIKE.COM

  29. #29
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    Quote Originally Posted by 2LO4U2C View Post
    This review of the 45nrth Dillinger 5 ....

    45NRTH Dillinger 5 – Six Week Test Ride | FAT-BIKE.COM
    Classic: "we tested it for 6 weeks, but never as a rear tire. I'm sure it has good traction and will be good in the snow, though."

    I've been anxiously awaiting some info on this tire, but this is pretty funny. I'm glad to at least hear some production-version width measurements though, and that's really the most important part, so thanks for posting this.
    We still hang bike thieves in Wyoming [Pedal House]

  30. #30
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    lots of new stuff added, PDF file attached, the image keeps getting downsized by the forum software
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  31. #31
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    My 2 Vee Bulldozers weighed in at 1339g and 1380g, and measure 109mm knob to knob on 80mm Sun Mulefut rims, tubeless, at 15psi. 104.5mm at casing.
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  32. #32
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    Quote Originally Posted by TitanofChaos View Post
    lots of new stuff added, PDF file attached, the image keeps getting downsized by the forum software
    This is GREAT work. Thanks for all the effort on this!!! I like the addition of the PDF too, the tables in the forums were impossible to read.

    One note, the Ground Control Fat tire is actually 1450g, not 1350g. I heard that 1350 somewhere too, but the special-ed website says 1450 and the one I got the other day was 1468.

  33. #33
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    Quote Originally Posted by JAGI410 View Post
    My 2 Vee Bulldozers weighed in at 1339g and 1380g, and measure 109mm knob to knob on 80mm Sun Mulefut rims, tubeless, at 15psi. 104.5mm at casing.
    Quote Originally Posted by jasongerken View Post
    This is GREAT work. Thanks for all the effort on this!!! I like the addition of the PDF too, the tables in the forums were impossible to read.

    One note, the Ground Control Fat tire is actually 1450g, not 1350g. I heard that 1350 somewhere too, but the special-ed website says 1450 and the one I got the other day was 1468.
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  34. #34
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    Quote Originally Posted by TitanofChaos View Post
    Awesome!

    Can you add placeholders for Knard 4.8, or whatever they are calling it. Panaracer Fat-B-Nimble, and the various versions of the Schwalbe Jumbo Jim? Schwalbe has specs listed on their site.

  35. #35
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    I weighed 4 Ground Controls and got anywhere from 1420g to 1486g

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    Quote Originally Posted by bme107 View Post
    Awesome!

    Can you add placeholders for Knard 4.8, or whatever they are calling it. Panaracer Fat-B-Nimble, and the various versions of the Schwalbe Jumbo Jim? Schwalbe has specs listed on their site.
    Curios what the reality size of the 4.8 Jumbo Jim is. Looks really jumbo.

  37. #37
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    Weighed a 60 TPI Fat B Nimble and got 1350. :-)

    My Snowshow (4.5 120TPI) was 1250 as well. I had the widths written down on my 47mm rims but I lost my paper and now the rims are in the shop getting laced up.

  38. #38
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    Some info for Specialized Ground Control 4.6". Bought two tyres. Measured bead to bead as per instructions and took four measurements for each tyre at approx 90 degree intervals. Also weighed them.

    Tyre 02145219:
    243; 244; 243; 245 -> average 244mm
    Weight = 1430g

    Tyre 03145131:
    240; 238; 239; 239 -> average 239mm
    Weight = 1440g

    Will post widths on 90mm rims as soon as the wheelbuilder finishes building up the wheelset.

    Thanks for the info provided in your PDF. I think it is really helpful.

  39. #39
    wjh
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    I am trying to determine if a dillinger 5 with studs will clear a 170 spaced 9zero7. Nates on margelites clear with room to spare and according to the chart they are both 99 mm wide. Can anyone verify that these 2 tires are in fact the same width? I measure my nate at 98 but a 4 and a 5" tire are the same size? Seems odd

  40. #40
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    Quote Originally Posted by wjh View Post
    I am trying to determine if a dillinger 5 with studs will clear a 170 spaced 9zero7. Nates on margelites clear with room to spare and according to the chart they are both 99 mm wide. Can anyone verify that these 2 tires are in fact the same width? I measure my nate at 98 but a 4 and a 5" tire are the same size? Seems odd
    About 4 and 3/8" on my LB 90mm rims from tread to tread. Couldn't believe the traction in deep snow today I run them on a 170mm bike. Some guys with skinnier rear ends are switching to 65mm rims just to be able to run them, although I'm not sure that'd be a huge benefit, but idk.
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  41. #41
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    Quote Originally Posted by Jayem View Post
    About 4 and 3/8" on my LB 90mm rims from tread to tread. Couldn't believe the traction in deep snow today I run them on a 170mm bike. Some guys with skinnier rear ends are switching to 65mm rims just to be able to run them, although I'm not sure that'd be a huge benefit, but idk.
    What bike is it? I know some bikes (salsa) are wider than a 907

  42. #42
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    Framed 26 x 4.0

    I don't have a way to weigh them.

    Bead to bead flat: 228mm
    80mm rim: 98mm

    Here is what some reviews showed for specs:
    Weight 1328g and 1330g
    The spread out test measuring bead to bead flattened out 225mm

  43. #43
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    OP. Thanks for doing this!

  44. #44
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    Vee8 on 80mm rim: 97mm measured. Oh, and please add the Panaracer Fat B Nimble tires.

  45. #45
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    Quote Originally Posted by TitanofChaos View Post


    Attachment 925861

    I'm trying to wrap my head around the attachment TitanofChaos posted. I have Nates on 80mm rims which supposedly measure in at 98mm. I'd like to go wider/higher volume but read that Ground Controls's and D5's can't fit a pugsley. However they come in at 97 and 99 respectively on 65mm rims. How accurate is the chart? Has anyone tried a 5'' tire on a 65mm in a pugsley? This is a great thread by the way.

  46. #46
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    can we get a thread that describes how the tires actually work too? I've been reading reviews for weeks now and my head is spinning. I need to buy tires in the next day or two for a race this weekend. Sucks that I have to spend almost as much as I paid for the bike to have it not suck big donkey.

  47. #47
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    Quote Originally Posted by ntm1973 View Post
    Quote Originally Posted by TitanofChaos View Post


    Attachment 925861

    I'm trying to wrap my head around the attachment TitanofChaos posted. I have Nates on 80mm rims which supposedly measure in at 98mm. I'd like to go wider/higher volume but read that Ground Controls's and D5's can't fit a pugsley. However they come in at 97 and 99 respectively on 65mm rims. How accurate is the chart? Has anyone tried a 5'' tire on a 65mm in a pugsley? This is a great thread by the way.
    There's a lot more to tire fit than just width, overall diameter and chain clearance play a big part

    lots of updates, thanks for all the info folks!
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  48. #48
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    I take interest in this post.

    On rolling darryl my 27tpi nates measured 3-15/16" wide. Freshly mounted 120 tpi D4 studded only measured 3-11/16" wide. Not to happy about that. Maybe there is some stretching over time? Will update.

  49. #49
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    Anybody have cross-references to provide Titan about the Bontrager Hodag? Seems to have escaped this list.

  50. #50
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    Just got my Vee Bulldozer 26x4.7 120TPI

    1330g/1360g
    248mm/250mm

    They will be going on 100mm rims soon.

    edit:

    115mm at the casing and 111.5 at the side knobs on 100mm rims with tubes at 15psi.
    Last edited by slowride454; 01-30-2015 at 12:47 AM.

  51. #51
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    Vee Rubber Mission Command 26x4.0 72TPI tubeless ready (stock tires on Mongoose Vinson) These have about 160 miles on them.

    1410g/1440g
    236mm/238mm

    they measured right at 4" on 100mm rims

  52. #52
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    Halo Nanuk 26x4.0 60tpi. Freshly mounted with 1/4 mile on 'em.

    210mm bead to bead.

    Measure exactly 3.5" wide at 10# on 65 mm Marge Lites. Tread-to tread, outer edge.

    Don't own a digital scale, other than my bathroom scale which is semi-accurate to 0.1 lbs. One tire felt a wee bit heavier than the other.

    I accomplished my goal of reducing the rotational mas of my wheels. By weighing myself, and then picking up my bike and weighing myself and the bike, both before I removed my Larrys, and doing the same after mounting these new Nanuks and substituting an ultralite Surly tube for the original (80 gram weight savings on the one tube), the same scale read 2.5 lbs less. That's with an error + or - 0.1 lb.
    At that level of accuracy, I suppose that I lost a approx 1.25 lbs per wheel.

    Almost forgot to mention that Nanuk is 3/8" (approx 10mm) smaller in diameter than Larry. A set of these will lower one's bottom bracket 3/16" compared to a set of the Larrys.
    Last edited by PlutonicPlague; 02-07-2015 at 12:49 PM.

  53. #53
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    The TRUE tire size thread



    These ties don't love laying completely flat due to wire bead and tall profile, but I get a shade over 10 1/2" bead to bead, or 267mm. They may be closer to 270mm.

    Chaoyang 4.9

    267mm bead to bead
    111.5mm casing
    101mm lug to lug
    ~1550 grams (not my measurement)

    Edited to adjust carcass width to 114 millimeters, when set up tubeless, at 15 psi.

    All measurements taken on 80mm rims.
    Last edited by AllMountin'; 02-15-2015 at 06:02 AM.

  54. #54
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    Why is this not a sticky? This should be sticky. Big props to TitanofChaos for putting that table together, how about something along the lines of a Googledoc that people could add their own info to? Just a thought

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    Tyres were mounted tubeless on 90mm rims a week ago, so I'm guessing they've had enough time to stretch out. 7psi. Widths on 90mm rims added below in bold.

    Quote Originally Posted by 2bliss View Post
    Some info for Specialized Ground Control 4.6". Bought two tyres. Measured bead to bead as per instructions and took four measurements for each tyre at approx 90 degree intervals. Also weighed them.

    Tyre 02145219:
    243; 244; 243; 245 -> average 244mm
    Weight = 1430g
    Width (sidewall-to-sidewall) on 90mm rim: 109mm
    Width (across side knobs) on 90mm rim: 112mm


    Tyre 03145131:
    240; 238; 239; 239 -> average 239mm
    Weight = 1440g
    Width (sidewall-to-sidewall) on 90mm rim: 108mm
    Width (across side knobs) on 90mm rim: 111mm

  56. #56
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    Quote Originally Posted by Willum View Post
    Why is this not a sticky? This should be sticky.
    I added a link to this thread to the Fatbike Info thread already stuck to the top of the board as I was searching for it after seeing a few people mention this thread.

  57. #57
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    Quote Originally Posted by TitanofChaos View Post
    There's a lot more to tire fit than just width, overall diameter and chain clearance play a big part

    lots of updates, thanks for all the info folks!
    Where is the latest version posted?

  58. #58
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    Don't think the chaotic Titan is updating the list anymore. Perhaps one of you IT geeks could transfer the info into a public document?

  59. #59
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    Quote Originally Posted by AllMountin' View Post
    Don't think the chaotic Titan is updating the list anymore. Perhaps one of you IT geeks could transfer the info into a public document?
    sorry, added 2 measurements for tires we already have data on and added 2 tires no one is talking about
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  60. #60
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    Muchas gracias.

    Also, I've got a fat b 4.0 that measures 85mm on a 47mm rim.

  61. #61
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    Quote Originally Posted by TitanofChaos View Post
    sorry, added 2 measurements for tires we already have data on and added 2 tires no one is talking about
    Where is the latest version of the document?

  62. #62
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    Quote Originally Posted by CraigH View Post
    Where is the latest version of the document?
    He has been replacing the pdf in the first post every time the list get's edited.

  63. #63
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    Quote Originally Posted by sean salach View Post
    He has been replacing the pdf in the first post every time the list get's edited.
    Thanks! I hadn't noticed the edit.

  64. #64
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    i wonder where i can buy the chaoyang 4.9 tire
    17 Lynskey Fatskey
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    My Parts for sale link

  65. #65
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    Thanks for all the great infohow about a column for tire circumference ?

  66. #66
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    Quote Originally Posted by akacoke View Post
    i wonder where i can buy the chaoyang 4.9 tire
    I tried to contact the fat bike company that installs them on their complete bikes to see if they sold them separate but they never responded.

  67. #67
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    Quote Originally Posted by CraigH View Post
    I tried to contact the fat bike company that installs them on their complete bikes to see if they sold them separate but they never responded.
    I asked at Wheel & Sprocket about them too. I suggested they sell them through their ebay store.

  68. #68
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    It appears you can order them from the u.k. eBay site. Shipping sticks you pretty good but it's still not bad for what you get.

  69. #69
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    Schwalbe Jumbo Jim 4.8", liteskin version.
    1350 grams
    111 mm width on an 80mm wide rim (Sun Mulefut) running tubeless at 15 PSI.

    Some weights from my postage scale:
    Vee Bulldozer 4.6" folding: 1350g
    Vee Snowshoe XL 4.8" folding: 1450 and 1460g
    Surly Big Fat Larry 4.7" 120 tpi: 1190g

  70. #70
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    LBS has a Farley 5 in stock. Stopped by last night to measure the Barbegazi 4.7's on 80mm Mulfuts.

    I measured:
    761mm diameter at max pressure
    116mm outside edge of tread at max pressure
    117mm sidewall width at max pressure
    113mm outside edge of tread at 10psi

    Sorry I couldn't get the flat casing or tread width. The shop and I were unprepared for the pain of pulling the tires off the rims. That should be a bullet-proof tubeless setup, for sure! People are gonna have to CUT those tires off those rims!

  71. #71
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    Schwalbe Jumbo Jim Evo foldable Liteskin 120 TPI 4.8 on 82 mm rims with 4.0 innertubes.

    - 260 mm bead to bead
    - 111 mm outside thread to thread

  72. #72
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    Dunderbeist
    1498grams
    248mm bead to bead

    Flowbeist
    1320 grams
    250mm bead to bead

  73. #73
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    I am not seeing the data. I am on my phone with tapatalk.

  74. #74
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    Quote Originally Posted by tundratrader View Post
    I am not seeing the data. I am on my phone with tapatalk.
    it's a link to a PDF in the first post of the thread.

  75. #75
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    I see a icon with mountain with sgwigly line horizontal.

  76. #76
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    Chaoyang 26x4.9 60 TPI folding

    bead to bead 272 mm
    mounted on 82 mm rim at 15 PSI
    knob to knob 106 mm

    somehow the rear Jumbo Jim looks bigger because of the side knobs.

    Anyone knows how much bigger both tires are gonna get if i put them tubeless?

  77. #77
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    Quote Originally Posted by Gabriel F. Popescu View Post
    Chaoyang 26x4.9 60 TPI folding

    bead to bead 272 mm
    mounted on 82 mm rim at 15 PSI
    knob to knob 106 mm

    somehow the rear Jumbo Jim looks bigger because of the side knobs.

    Anyone knows how much bigger both tires are gonna get if i put them tubeless?
    Not sure on the growth, but I found the same thing. Sitting next to Spesh Ground Control, the GC looked bigger, even though the numbers don't back that up.

  78. #78
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    I measured the 27.5" Hodag 3.8, and the bead to bead was 215mm. I measured 1260 g.

  79. #79
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    Bump to keep this near the top

  80. #80
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    Bontrager Barbegazi 26 x 4.7 120tpi Team Issue folding (stock on 2016 Farley 5)

    Weight 1.346 kg / 1.356 kg (front & rear) = 1.35kg / 3lbs average

    I couldn't get the carcass to lay completely flat, but the bead to bead measurement with it as flat as it would go is 260mm / 10.25" (would be more if it would lay flat).

    On the stock 80mm Mulefut rims it measures ~115mm / 4.5" across the knobs at ~~10 PSI.

  81. #81
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    Quote Originally Posted by Misterg View Post
    Bontrager Barbegazi 26 x 4.7 120tpi Team Issue folding (stock on 2016 Farley 5)

    Weight 1.346 kg / 1.356 kg (front & rear) = 1.35kg / 3lbs average

    I couldn't get the carcass to lay completely flat, but the bead to bead measurement with it as flat as it would go is 260mm / 10.25" (would be more if it would lay flat).

    On the stock 80mm Mulefut rims it measures ~115mm / 4.5" across the knobs at ~~10 PSI.
    I'll remeasure mine before I mount it tomorrow, but Barbegazi 120 TPI folding as well, 1360g. 255mm bead to bead. Will be mounting on Marge Lites, hoping to fit rear of 170mm 907.

  82. #82
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    Forgot to measure the bead to bead width, but I just mounted up a snowshoe xl. At 10psi, new (no time to stretch out), 80mm rims (Mulfut), tubeless, it measures 111 mm to lugs, 109 carcass.

    Update. After stretching for a week or so, it measures 111 at the carcass. Had to trim knobs for it to fit in my frame, so I don't know exactly the knob width, but I would guess about 113.

    Typed on my phone. Pardon the autocorrect.
    Last edited by fotooutdoors; 11-20-2015 at 05:56 AM.

  83. #83
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    Snowshoe XL's

    1474 g, 1530 g

    117 mm knob to knob on 90 mm rims
    114 mm at the carcass

    standard 4.0/4.9 tubes 623 g
    specialized 24x2.4-3.0 presta tubes 283 g

    rolls fairly smooth @ 9 psi with my 200 lb self aboard
    sounds like it's ripping apart the fabric of the earth @ 7 psi
    (I'm talking velcro like/kung fu grip)
    starts to feel "floaty" like you're riding
    a marshmallow or a cloud at below 6 psi

    not surprisingly self steer also begins to show up around 7 psi
    when the traction goes through the roof

    The wire bead, 72 tpi Vee H-Billies (4.25) these replaced
    were both 1445 grams.
    Last edited by mccartney7499; 11-20-2015 at 08:22 AM.
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  84. #84
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    45nrth Dillinger 5 studded 1528g & 1605g
    Schwalbe Jumbo Jim 4.0 light skin 1109g & 1090g
    ptarmigan hardcore

  85. #85
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    I got 1180g and 1137g for my JJ 4.0 Liteskins.
    So much for the 999g ones that were floating about when they first became available


    Fat Biker

  86. #86
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    My sad story... I put a Dillinger 5 studded on the rear of my 2014 Farley with am 80mm wheel last year and it just fit. Three studs "ticked" the derailleur, but I didn't care, I ran it anyway. Fast forward to this year, I bought a Dillinger 5 unstudded to run on the rear. Guess what! I can't even squeeze it in there, even with 5 psi it's too big and too fat! Hard to believe there is that much discrepancy it the same tire and brand. So reading spec's and tire sizes doesn't always work as I found out. Makes me wonder if I bought 5 tires and tried them all until I found one that fit. ps, I even unmounted and rotated and remounted the tire several times because I really wanted it to work, but no dice.

  87. #87
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    I have two new Maxxis Minion FBF and FBR tires. They claim 4.8" but they measure
    FBF 4.18" on a 81mm DT Swiss BR 710
    FBR 4.31" on a 81mm DT Swiss BR 710

    Honestly a bit of a disappointment.




    -Joe
    Last edited by xjoex; 12-05-2015 at 08:35 PM.

  88. #88
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    Quote Originally Posted by TitanofChaos View Post
    ohh no, here we go again, not another tire thread

    I'd really like all the info in one place, so lets see what we can gather here

    Post your actual inside bead to bead measurements with tires lying flat so help us out filling in missing data where we can

    here's what I've gathered from other threads and this one, if I'm missing any tires and you have the info, post it up

    all collected data is in black, if measurements came in together I kept them on the same line

    I added averages and estimates so we can see the predictions and the actuals

    Rim sizes added as well, no I don't care if there's a 44 and a 102 or whatever, this is enough

    Weights added, these are averages or published weights, tires fluctuate by up to 100g, usually 50 one way or the other from the numbers in the chart

    tire sizes.pdf
    Hey thanks for doing this, it is VERY helpful.

    One thing that likely messes with fit is aspect ratio: tire depth/sidewall height. A lower aspect fat tire is likely going to fit a [marginal] frame where a higher aspect ratio fat tire is going to hit the stays. Wouldn't take more than a centimeter to screw things up and it appears that air pressure figures prominently here. Higher pressure stacks sidewall height.

  89. #89
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    Incredibly useful thread, given the price of these tires. Thanks to the OP.

  90. #90
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    Quote Originally Posted by xjoex View Post
    I have two new Maxxis Minion FBF and FBR tires. They claim 4.8" but they measure
    FBF 4.18" on a 81mm DT Swiss BR 710
    FBR 4.31" on a 81mm DT Swiss BR 710

    Honestly a bit of a disappointment.




    -Joe
    weight is 1600gramm per tire?
    Then i certainly stick with my 4.6 45nrth ..

  91. #91
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    I will be taking delivery of a 2016 KHS Four Seasons 1000 in a matter of hours, I will measure the ChaoYang made KHS 120TPI Foldable 26 x 4.9s as mounted on 100mm rims the bike comes with, but if the bead-to-bead number a few messages back is correct, they should be monsters.

    Ok so they're a tall casing tire, bead to bead flat is 260mm but the tread is only 113mm flat and as what is essentially the same tire design as Panaracer's Fat B Nimble (which also never actually lives up to its claimed width) this didn't surprise me too much. At 5.7psi on 100mm rim the casing measured out to 115mm width but the tread was only about 103mm. Light weight and very supple casing though, 1306 grams for the front one on the bike and 1335g for the rear one. If you're after a large air volume with a fast rolling footprint this is a good tire to run.


    The TRUE tire size thread-bigdaddy1.jpgThe TRUE tire size thread-bigdaddy2.jpg
    Last edited by DeeEight; 12-24-2015 at 10:15 PM.
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  92. #92
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    Anyone got measurements of the Maxxis Colossus yet?

  93. #93
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    Quote Originally Posted by slabber View Post
    I'll remeasure mine before I mount it tomorrow, but Barbegazi 120 TPI folding as well, 1360g. 255mm bead to bead. Will be mounting on Marge Lites, hoping to fit rear of 170mm 907.
    So how is it ? Width ?

  94. #94
    LCW
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    Flowbeist/Dunderbeist 26x4.6

    Didn't measure bead to bead (saw this thread after they were already mounted), but happended to weigh them before installing:

    Flowbeist: 1380g
    Dunderbeist: 1440g

    And in comparison, Surly Nate 26x4.0 27tpi pair weighed:
    -1720 & 1760g

    ... so pretty good savings!!!


    Rough measurement of them installed, after about 1/2 dozen rides (6-8 psi), they are appox 4.2" (107mm) at the knobs, 4 (101mm) at the casing. Far cry from the "4.6" they are supposed to be. This is on My Other Brother Darryl rims. Running them tubeless.

    Santa Cruz Hightower LT


  95. #95
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    Quote Originally Posted by DeeEight View Post
    I will be taking delivery of a 2016 KHS Four Seasons 1000 in a matter of hours, I will measure the ChaoYang made KHS 120TPI Foldable 26 x 4.9s as mounted on 100mm rims the bike comes with, but if the bead-to-bead number a few messages back is correct, they should be monsters.

    Ok so they're a tall casing tire, bead to bead flat is 260mm but the tread is only 113mm flat and as what is essentially the same tire design as Panaracer's Fat B Nimble (which also never actually lives up to its claimed width) this didn't surprise me too much. At 5.7psi on 100mm rim the casing measured out to 115mm width but the tread was only about 103mm. Light weight and very supple casing though, 1306 grams for the front one on the bike and 1335g for the rear one. If you're after a large air volume with a fast rolling footprint this is a good tire to run.


    Click image for larger version. 

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    Hello Dee8, ive been on the fence about buying a 2016 1000 khs, may we know your impressions please? Ive been riding a 2015 and been quite happy with it. But its smaller frame cant accomodate the bigger tires unfortunately. Thanks.
    Last edited by Charliegreen; 01-18-2016 at 09:12 AM. Reason: Forgot details

  96. #96
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    Quote Originally Posted by Jukahia View Post
    So how is it ? Width ?
    Sorry, didn't see this question earlier, not visiting site that regularly these days...

    Mounted tubeless on Marge Lites - casing measured out just over 104mm, knob width 109.5mm.

    Pretty happy with the tire overall, but going to try Flowbeist now for more positive cornering traction as the Barbegazi knobs aren't super tall but it does roll relatively well as a result.

  97. #97
    Old, Slow and now FAT! :)
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    The TRUE tire size thread

    Quote Originally Posted by LCW View Post
    Flowbeist/Dunderbeist 26x4.6

    Didn't measure bead to bead (saw this thread after they were already mounted), but happended to weigh them before installing:

    Flowbeist: 1380g
    Dunderbeist: 1440g
    That's a low weight for your tired. Is that accurate?

    I weighed mine on kitchen scales and mine came to:

    Flowbeist 1446g
    Dunderbeist 1479g

  98. #98
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    Just browsing this thread to help inform my next tyre purchase and saw the Maxxis Minion FBF size quoted. I have an FBF on the same rim (81mm) and it measures 4.46" @ 10psi. Quite a difference - that is the outside knob measurement.

  99. #99
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    I did not take them off the rim, but the Kenda 4.5" Gumwalls measured 4.49" wide on a 101mm rim:
    Attached Thumbnails Attached Thumbnails The TRUE tire size thread-223.jpg  


  100. #100
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    Quote Originally Posted by GiantTurd View Post
    Anyone measure a JJ 4.8 on a 65mm rim?
    Someone from the Jumbo Jim thread said 110mm on 65. Not sure how accurate that is.

    http://forums.mtbr.com/showthread.php?p=12483975

  101. #101
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    Recently purchased a Jumbo Jim 4.4" (Snakeskin) to my alloy Beargrease. The tire weighed in at 1205 g. I did not measure the bead to bead width, but on a 65 mm rim with 0,6 bar pressure the width at the knobs was about 104 mm and at the casing, about 99 mm. Quite reasonable

    Update: on mulefut (already stretched) 0,5 bar pressure: knobs 105 mm, casing 106 mm (≈4,17").
    Last edited by kyttyra; 03-11-2017 at 11:40 PM.

  102. #102
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    Terrene Wazia 4.6 Studded.
    1668g on kitchen digi scale.
    240mm bead to bead same as my 45nrth D5s
    102mm on my DT Swiss BR710 81mm rim and 106m knob to knob.
    Attached Thumbnails Attached Thumbnails The TRUE tire size thread-20161201_185413small.jpg  

    The TRUE tire size thread-20161201_185919small.jpg  

    Last edited by Co-opski; 01-16-2018 at 05:27 PM.
    ptarmigan hardcore

  103. #103
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    Quote Originally Posted by kyttyra View Post
    Recently purchased a Jumbo Jim 4.4" (Snakeskin) to my alloy Beargrease. The tire weighed in at 1205 g. I did not measure the bead to bead width, but on a 65 mm rim with 0,6 bar pressure the width at the knobs was about 104 mm and at the casing, about 99 mm. Quite reasonable
    Thank you!. I've been hoping to hear some measurements of a 4.4 JJ width on a 65mm rim.
    How do you like the profile? Are the shoulder knobs still where we'd want 'em for good cornering grip?

  104. #104
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    The TRUE tire size thread

    When is everyone measuring. My gnarwhal was almost flush with the sides of my mulefut new, now it has some bulge out. Would say it probably widened 1/4"
    Fatbike, XC bike, Gravel Bike....

  105. #105
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    Quote Originally Posted by Co-opski View Post
    Terrene Wazia 4.6 Studded.
    1668g on kitchen digi scale.
    240mm bead to bead same as my 45nrth D5s
    105mm on my DT Swiss BR710 80mm rim.
    How's the Wazia in snow? Any chance you've ridden it on any wet roots as well? Been eyeballing it but can't find much info as far as rubber compound, durameter, or reviews for that matter..... Thx!!

  106. #106
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    Quote Originally Posted by Techspec360 View Post
    How's the Wazia in snow? Any chance you've ridden it on any wet roots as well? Been eyeballing it but can't find much info as far as rubber compound, durameter, or reviews for that matter..... Thx!!
    The ground
    has been frozen this winter. I have had them in light loose snow, hardpack groomers and an ice rink. More info here. http://forums.mtbr.com/fat-bikes/new...s-1023861.html
    ptarmigan hardcore

  107. #107
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    Quote Originally Posted by PlutonicPlague View Post
    Thank you!. I've been hoping to hear some measurements of a 4.4 JJ width on a 65mm rim.
    How do you like the profile? Are the shoulder knobs still where we'd want 'em for good cornering grip?
    The profile is (not surprisingly) quite rounded. I have a feeling that for best cornering grip a little wider rim would be better, but so far I'm not complaining.

  108. #108
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    Snowshoe 2XL on 80mm DT-Swiss rim. Knob to knob. 10Psi and tubeless. Now over a month from that picture width is 127-128mm.

    The TRUE tire size thread-file-27.10.2016-9.00.21.jpeg
    Life, Love & The Blues. And Fatbiking.

  109. #109
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    Just got a pair Jumbo Jim 4.4 Liteskins. Weight: 1174 grams, casing width: 245 mm.
    --Peace

  110. #110
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    I may have missed it, but my 120TPI Fat B Nimbles (FBN) measure a true 4" on a 100mm rim with about 10psi. They work very well in the sandy washes here in Az. Great budget tire for here.

    The TRUE tire size thread-20161217_174256.jpg

    The TRUE tire size thread-20170103_230354-1.jpg

  111. #111
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    Quote Originally Posted by brownmruk View Post
    Just browsing this thread to help inform my next tyre purchase and saw the Maxxis Minion FBF size quoted. I have an FBF on the same rim (81mm) and it measures 4.46" @ 10psi. Quite a difference - that is the outside knob measurement.
    I just measured my FBF 4.8 on a 80mm Sun Ringle Mule Fut: 4.375". Brand new tire, no time to stretch.
    it's a challenge some of us are ultimately worthy of.

  112. #112
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    updated my 4.6 Wazia numbers.
    ptarmigan hardcore

  113. #113
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    Snowshoe XL'S on a 100 mm rim or Snowshoe 2XL's on a 80 mm rim. Anybody got numbers on this?
    :thumbsup:It doesn't matter what I ride as long as I ride it Rubber Side Down●~●.

  114. #114
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    Quote Originally Posted by RockyJo1 View Post
    Snowshoe XL'S on a 100 mm rim or Snowshoe 2XL's on a 80 mm rim. Anybody got numbers on this?
    XL's on 100 width 4.54" or 115.47mm. Casing and knob width for all intents and purposes the same.
    Latitude 61

  115. #115
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    Quote Originally Posted by RockyJo1 View Post
    Snowshoe XL'S on a 100 mm rim or Snowshoe 2XL's on a 80 mm rim. Anybody got numbers on this?
    All at industry standard 20psi test pressure:
    I have measured tons of XLs and they are typically 4.7 to 4.8 on 100s.
    They are 4.4'' on my current 80mm ice setup.
    2XLs are typically spot on 5.0 on an 80.
    If you are checking for comparison, remember that the rolling diameter of the 2XL is much, much bigger than the XL. It is a 300mm bead to bead tire vs. 260mm for true size 4.8s (XL, JJ, Bud/Lou, etc).

    4.0s are typically around 220mm, so the difference in volume beween the 2XL and a 4.8 is as big as the difference between a 4.8 and a 4.0.

  116. #116
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    Quote Originally Posted by Espen W View Post
    All at industry standard 20psi test pressure:
    I have measured tons of XLs and they are typically 4.7 to 4.8 on 100s.
    They are 4.4'' on my current 80mm ice setup.
    2XLs are typically spot on 5.0 on an 80.
    If you are checking for comparison, remember that the rolling diameter of the 2XL is much, much bigger than the XL. It is a 300mm bead to bead tire vs. 260mm for true size 4.8s (XL, JJ, Bud/Lou, etc).

    4.0s are typically around 220mm, so the difference in volume beween the 2XL and a 4.8 is as big as the difference between a 4.8 and a 4.0.
    Cool thanks. Trying to decide between getting 2XL's on 80's or get 100mm rims and run my XL's.
    :thumbsup:It doesn't matter what I ride as long as I ride it Rubber Side Down●~●.

  117. #117
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    Quote Originally Posted by Espen W View Post
    All at industry standard 20psi test pressure:
    I have measured tons of XLs and they are typically 4.7 to 4.8 on 100s.
    They are 4.4'' on my current 80mm ice setup.
    2XLs are typically spot on 5.0 on an 80.
    If you are checking for comparison, remember that the rolling diameter of the 2XL is much, much bigger than the XL. It is a 300mm bead to bead tire vs. 260mm for true size 4.8s (XL, JJ, Bud/Lou, etc).

    4.0s are typically around 220mm, so the difference in volume beween the 2XL and a 4.8 is as big as the difference between a 4.8 and a 4.0.
    Great info, thanks! I am trying to decide between grip studding my Ground Controls or buying a studded pair of tires. I am running my 4.6 GC's on a 170mm Mukluk frame on 82mm rims. They measure 4.3" in this config. Enough to avoid frame rub/chain rub (had to install a wider BB) but don't think I can go much wider. Grip studding will run about $120 - $150 per tire. Studded Vee XL's go for about that much new these days, but I can only find 4.8's. Any idea where I can find 4.0's? I have searched online with no luck. Any other studded tire suggestions in this price range welcome. Thanks!

  118. #118
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    Can we get this stickied?

  119. #119
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    White silica snowshoe xl 26 x 4.8 250mm 1660g

  120. #120
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    Jumbo Jim 26 x 4.0 @ 20 psi mounted on a Surly Rabbit Hole 50mm rim measured at the knobs (widest part) 3.8 (96.53mm). Also clears on my Manitou Magnum 27.5 boost fork.

  121. #121
    Flying Sasquatch
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    Quote Originally Posted by gumba View Post
    Jumbo Jim 26 x 4.0 @ 20 psi mounted on a Surly Rabbit Hole 50mm rim measured at the knobs (widest part) 3.8 (96.53mm). Also clears on my Manitou Magnum 27.5 boost fork.
    Could you post a pic of this setup ? I've always been curious what a 4.0 (or 3.8) looks like on a 50mm rim..

  122. #122
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    This is the JJ, I've also test fit the H-Billie 4.25, and the Nate 3.8. More to make sure it clears the fork.The TRUE tire size thread-salsa-jj-sm.jpg

  123. #123
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    Quote Originally Posted by KTMNealio View Post
    Could you post a pic of this setup ? I've always been curious what a 4.0 (or 3.8) looks like on a 50mm rim..
    Tire Size V. Rim Size- Mtbr.com

    It is an old photo with old tires but the first post in the attached thread should do it.
    Latitude 61

  124. #124
    Chris Bling
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    Anyone have a b2b measurement on a set of Jumbo Jim 4.8 tires?

  125. #125
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    Quote Originally Posted by dustyduke22 View Post
    Anyone have a b2b measurement on a set of Jumbo Jim 4.8 tires?
    From memory approx 265mm
    In other words, some of the widest 4.8 labeled ones out there.
    Typical 4.8 width is right at 260m B-B

  126. #126
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    Quote Originally Posted by Espen W View Post
    From memory approx 265mm
    That's what I've recorded from other members as well.

  127. #127
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    Quote Originally Posted by bme107 View Post
    That's what I've recorded from other members as well.
    Thanks guys. I have it mounted on some 70mm rims are really dig the profile. Still plenty of float, but so much more fun on trails. No self steer and fun as heck. Here is a pic.

    I have some new studded Cake Eaters that are 4.6, so I was curious how much smaller they will be.



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  128. #128
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    Quote Originally Posted by gumba View Post
    This is the JJ, I've also test fit the H-Billie 4.25, and the Nate 3.8. More to make sure it clears the fork.Click image for larger version. 

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    Do you have any pics of the clearance in the fork? I've been wondering about this combo in my Magnum Pro. Sent you a PM also.
    "I ride to clear my head, my head is clearer when I'm riding SS. Therefore, I choose to ride SS."~ Fullrange Drew

  129. #129
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    Quote Originally Posted by dustyduke22 View Post
    Thanks guys. I have it mounted on some 70mm rims are really dig the profile. Still plenty of float, but so much more fun on trails. No self steer and fun as heck. Here is a pic.

    I have some new studded Cake Eaters that are 4.6, so I was curious how much smaller they will be.



    Sent from my SPH-L720T using Tapatalk
    How are you liking the cake eaters? Im thinking about picking up a set and trying to decide between the 4 and 4.6.

  130. #130
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    Here are some of the Terrene Cake Eater 4.6 120 TPI next to 45nrth Dillinger 5 120 TPI and Terrene Wazia 4.6 120tpi on DT Swiss BR710 rims that are 76mm inner and 81mm outer rim width.
    Measured on the BR710 103mm casing width and 109mm to the tread knobs. 240mm bead to bead same as my Wazia 4.6 and 45nrth D5s
    1580g on my weed scale.
    The TRUE tire size thread-20180112_201959.jpg
    Dillinger 5 vs Cake Eater 4.6
    The TRUE tire size thread-20180115_123748.jpg
    The TRUE tire size thread-20180115_123812.jpg
    Cake Eater 4.6 vs Wazia 4.6
    The TRUE tire size thread-20180115_130955.jpg
    The TRUE tire size thread-20180115_131008.jpg
    ptarmigan hardcore

  131. #131
    Chris Bling
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    Quote Originally Posted by tschram72 View Post
    How are you liking the cake eaters? Im thinking about picking up a set and trying to decide between the 4 and 4.6.
    They are studded and currently we have no snow!

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  132. #132
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    Mounted tubeless on 100 mm rims, Origin8 120 TPI folding bead Tsunami measurements @ 5 PSI, 35 Degrees F

    Tsunami 4: Tread - 3.5" / Sidewall - 4.3"

    Tsunami 4.9: Tread - 4.1" / Sidewall - 5"
    Yukon Truck
    Novatec / Mulefut 80's
    Tsunami 4.9's

  133. #133
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    Quote Originally Posted by Co-opski View Post
    Here are some of the Terrene Cake Eater 4.6 120 TPI next to 45nrth Dillinger 5 120 TPI and Terrene Wazia 4.6 120tpi on DT Swiss BR710 rims that are 76mm inner and 81mm outer rim width.
    Measured on the BR710 103mm casing width and 109mm to the tread knobs. 240mm bead to bead same as my Wazia 4.6 and 45nrth D5s
    1580g on my weed scale.
    Click image for larger version. 

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    Dillinger 5 vs Cake Eater 4.6
    Click image for larger version. 

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ID:	1178457
    Click image for larger version. 

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    Cake Eater 4.6 vs Wazia 4.6
    Click image for larger version. 

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    Click image for larger version. 

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    Here is a Cake Eater 4.6 studded next to a Wazia 4.0

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    Affordable Custom Wheels

  134. #134
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    xxx
    Last edited by Kirkerik; 03-03-2018 at 07:58 PM.
    Studded Dillinger 4/5 For Sale

    The tires are the things on your bike that make contact w the trail

  135. #135
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    Quote Originally Posted by Pack66 View Post
    Can we get this stickied?
    i would find it more useful than the daily pics thread that is stickied.

  136. #136
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    Believe it was stickied at one point. Ebb and flow of the times.
    There was a big influx of people posting numbers 2-3 years ago and now that is on the wane. With fewer new offerings the excitement dies out........

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