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  1. #1
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    does tire change of 2.2 -> 2.4 prompt cog change?

    Just curious if anyone has made a relatively large leap in rear tire casing size and felt like the larger diameter should be adjusted for with a higher tooth-count cog. I'm changing from a smallish Conti MK 2.2 in the back to an Ardent 2.4 monster. Maybe it's a negligible difference but It's got me wondering.

  2. #2
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    Reputation: J.B. Weld's Avatar
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    You can check out the effects that tire size has on gearing here-

    BikeCalc.com - Bicycle Gear Inches Chart

    Going from 2.2 to 2.4 does change your gearing some but not enough to warrant switching anything.

  3. #3
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    Ride and see. But for me, wasn't necessary.

  4. #4
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    I would say no. I used to change from slicks (1.9) to mud tires(2.2), city commuting vs weekend dirt rides, but never felt I needed to change the rear cog. I had to change when I went to 650b, I think going to a larger rim warrants the switch, but not a larger tire.
    No fuss with the MUSS

  5. #5
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    I think a major change in weight and rolling resistance might be a reason to adjust. Probably not an issue though for your case.

  6. #6
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    Quote Originally Posted by jmmorath View Post
    I think a major change in weight and rolling resistance might be a reason to adjust. Probably not an issue though for your case.

    Agreed. When I put a heavier, beefier tire out back, I generally end up adding a tooth, but not just for the tire itself, more because I'm going on a bigger, tougher trail ride where I'll need said tire and said gear...

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