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  1. #1
    Lord Thunderbottom
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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
    Lord Thunderbottom
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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
    gone walk about
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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
    Lord Thunderbottom
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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
    Today I will do what others won't, so tomorrow I can do what others can't

  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
    Lord Thunderbottom
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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
    Today I will do what others won't, so tomorrow I can do what others can't

  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
    Lord Thunderbottom
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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.

    Sent from my XT1060 using Tapatalk
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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...

  16. #16
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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.

    Steven
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  19. #19
    drev-il, not Dr. Evil!
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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.)
    "Keep your burgers lean and your tires fat." -h.d. | ssoft | flickr

  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
    Lord Thunderbottom
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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
    Lord Thunderbottom
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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
    Fat & Single
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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
    Lord Thunderbottom
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    measured some missions last night
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  27. #27
    Lord Thunderbottom
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    More measuring, added a sterling bead length and BFL bead length and size on uma 70
    Today I will do what others won't, so tomorrow I can do what others can't

  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
    Lord Thunderbottom
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    lots of new stuff added, PDF file attached, the image keeps getting downsized by the forum software
    Today I will do what others won't, so tomorrow I can do what others can't

  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.
    Jason
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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
    Lord Thunderbottom
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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

  36. #36
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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.
    "It's only when you stand over it, you know, when you physically stand over the bike, that then you say 'hey, I don't have much stand over height', you know"-T. Ellsworth

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  41. #41
    wjh
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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!
    Fat and Single

  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
    Lord Thunderbottom
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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; 01-29-2015 at 11:47 PM.

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