rim width effect on tire width- Mtbr.com
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  1. #1
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    rim width effect on tire width

    I searched but couldn't find any info.
    I am currently running a Surly Lou on a 80mm Mulefut. I really want to go to a 100mm rim, but I'm also very very tight clearance wise.
    So curious if anyone can say for sure how much my Lou will widen with that wider rim?
    Thanks!!!

  2. #2
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    My mad math skillz predict about +10mm per side
    ...but my gut tells me it will be about half of that.

  3. #3
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    It's been a while.....but it was around 8mm difference on a well stretched Lou

  4. #4
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    Found the info on Surly's website, Looks like a Lou grows 7-8mm going from an 80mm to a 100mm rim.
    Thanks Everybody.

  5. #5
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    Quote Originally Posted by wookieone View Post
    Found the info on Surly's website, Looks like a Lou grows 7-8mm going from an 80mm to a 100mm rim.
    Thanks Everybody.

    jefe -- ping me before you move forward. might have something for you.

  6. #6
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    One way to estimate it: The cross section of a tire is roughly a circle. Think of the rim width as being part of the circumference. With diameter = circumference / pi, one could expect the diameter to change roughly by (100-80)/pi, so around 6.4mm. Now the rim really acts as a chord and not part of the circumference so one should expect the diameter to grow more than the perfect circle formula would suggest. Adding 1-2mm seems prudent and voila, you are at the 7-8mm Surly suggests. Divide by two for clearance lost on each side. Again, a tire cross section is not a perfect circle, so that results in but an estimate.

  7. #7
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    A friend runs the FBR on his 80mm Turnagain rim and I run the same tire on my 100mm Turnagain rim. His tire measures 4.442" and mine measures 4.585", which is a difference of 0.143", or 3.63mm. We are the same weight and there have been times I stayed afloat and he sank in the snow.
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  8. #8
    Rippin da fAt
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    Quote Originally Posted by wookieone View Post
    I searched but couldn't find any info.
    I am currently running a Surly Lou on a 80mm Mulefut. I really want to go to a 100mm rim, but I'm also very very tight clearance wise.
    So curious if anyone can say for sure how much my Lou will widen with that wider rim?
    Thanks!!!
    What is the clearance with your current setup?

    My Bud/Lou gained 5-6mm in width going from 80's to 100's. The notable difference is in the radius of the crown of the tire and how the tires ride and feel.
    Get fAt, Stay fAt, Ride fAt
    Doctor recommended...

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