Big Rim - Little Tire?- Mtbr.com
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  1. #1
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    Big Rim - Little Tire?

    Hey folks, have a bit of a dilemma I am looking for an opinion on. I have a 2019 beargrease which I am running a set of 150/197 spacing 27.5 wheels on (carbon onyx combo). My rims are internal 70mm...

    When spring hit's I was thinking about building another set of wheels and running 29+ on the bike for the summer but part of me wants to see what a 3" 27.5 would look like on those wheels. Anyone ever mounted a 3.0 on a i70 rim? Obviously it's not optimal but would it be completely horrible? Who's making the bulkiest 3.0 these days?

    Thanks in advance.

  2. #2
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    I'd look at the 27.5 x 3.8 Hodags
    They run a little small so more like a 3.5
    Good compromise of weight/traction/durability

    Take into consideration the bottom bracket drop going to a 3"er as well

  3. #3
    turtles make me hot
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    Yep. 3.8 is as small as I would go.
    I like turtles

  4. #4
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    I am actually running 27.5 x 4 Vanhelga's at the moment so that might not be enough drop for me. I typically ride 2.6" tires in the summer so 3" is considered enormous by my standards for dry weather.

  5. #5
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    Years ago a guy with a Pugsley did this to test if readily available parts throughout remote areas of the globe could be made to work in a pinch. Think he got 2.4's on the original Large Marges with a tube. Also for science he was trying regular/narrow un-dished wheelsets to see if they would clear the frame.

  6. #6
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    I might give it a go just to see how the profile ends up, I already have the wheels just need some tires to throw on there...

  7. #7
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    With carbon hoops you may want to stick with a wider tire if you ride trails that could be hazardous to your rims.

  8. #8
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    That was def a concern as well, those side strikes could be bad...I just don't feel like buying another set of 1200 wheels haha.

  9. #9
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    Think of it this way. If you run 3.0 tires on your 70mm rim you will almost be guaranteed to buy a new $1200 set of rim but you won’t have 2 wheel sets. I won’t run 4.8” tires on 100mm rim because of the rim damage I had from one summer. I can’t even imagine what you would have with your combo. I also have a set of 27.5x3 rocket fonts on 50mm external rims and even those have some scratches on the rims from rocks and I ride in the Midwest which is not particularly rocky.

  10. #10
    turtles make me hot
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    I was there when a friend ruined a carbon 80mm rim with a 3.8" tire. After he got a new wheel, he put Dillinger 5's on those wheels and never had another problem.

    You just answered your own question. Don't do it.
    I like turtles

  11. #11
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    I built a nice set of 29+ wheels for my ride as it is near impossible to find a pre-made 150/177 wheelset. For 150/197 you have more options If you want to scratch your curiosity itch, check these out:

    PAIR of 29 PLUS FatBike WTB TCS Tubeless Compatible Wheels + FREE Tires: VeeRubber TraxFatty 29x3 inch

  12. #12
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    Also - when you put a small tire on a wide rim, it corners like a tank. You need the round profile.

  13. #13
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    I just picked up a set of these. They are 27.5

    https://www.ebay.com/itm/NEW-SUN-RIN...-/112768677316

  14. #14
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    Big Rim - Little Tire?

    Quote Originally Posted by manhattanprjkt83 View Post
    I might give it a go just to see how the profile ends up, I already have the wheels just need some tires to throw on there...
    https://m.pinkbike.com/buysell/2291540/

    3” on 65mm rims

    They look close to 3.8 on 80mm

    Sent from my iPhone using Tapatalk
    Fatbike, XC bike, Gravel Bike....

  15. #15
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    Not the original question but I really enjoy riding full fat in the summer. Massive traction for railing corners. Consider doing nothing?

  16. #16
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    Quote Originally Posted by NYrr496 View Post
    I was there when a friend ruined a carbon 80mm rim with a 3.8" tire. After he got a new wheel, he put Dillinger 5's on those wheels and never had another problem.

    You just answered your own question. Don't do it.
    I agree that 3" is not a good choice for 70mm rims. But seriously, the most common combination for years was, and still may be, 3.8 to 4 inch tires on 80mm rims. Of course a few rims got mangled but so many more didn't.
    Latitude 61

  17. #17
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    Quote Originally Posted by BlueCheesehead View Post
    I built a nice set of 29+ wheels for my ride as it is near impossible to find a pre-made 150/177 wheelset. For 150/197 you have more options If you want to scratch your curiosity itch, check these out:

    PAIR of 29 PLUS FatBike WTB TCS Tubeless Compatible Wheels + FREE Tires: VeeRubber TraxFatty 29x3 inch
    I've thought about these but the rims appear to have a width of 25mm which seems pretty narrow for any plus tire. Seems they'd be better suited for skinny 29er tires. If I'm wrong I'd love someone to correct me and I'd buy some for a summer wheelset.

  18. #18
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    Quote Originally Posted by Cerpss View Post
    I've thought about these but the rims appear to have a width of 25mm which seems pretty narrow for any plus tire. Seems they'd be better suited for skinny 29er tires. If I'm wrong I'd love someone to correct me and I'd buy some for a summer wheelset.
    If you want a suitable rim for plus tires, look at RaceFace Arcs in 40mm.
    I like turtles

  19. #19
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    Quote Originally Posted by Cerpss View Post
    I've thought about these but the rims appear to have a width of 25mm which seems pretty narrow for any plus tire. Seems they'd be better suited for skinny 29er tires. If I'm wrong I'd love someone to correct me and I'd buy some for a summer wheelset.
    Hmmm, I glossed over the i25. Yep, too narrow IMO. Not a bad deal if one wants to run standard 29'r

  20. #20
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    For summer use and supa hardpack snow (like last Saturday), I'm running a tiny, old MTB tire that I found in my basement, on 100mm rims. The tires are called Jimbo Jim 2 or 4 or something. Can't recall, but real small. Still works on a fairly wide rim like a hundie.
    Last edited by Espen W; 03-05-2019 at 03:20 AM.

  21. #21
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    Quote Originally Posted by Jaker View Post
    I just picked up a set of these. They are 27.5

    https://www.ebay.com/itm/NEW-SUN-RIN...-/112768677316
    I'd really like to know what you think of these when you get them.

  22. #22
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    Quote Originally Posted by timsmcm View Post
    I'd really like to know what you think of these when you get them.
    Seem pretty good.

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