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  1. #1
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    Max tire width with 20mm wide rims

    I've got an old steel Mercian frame with cantis that's got plenty of room for wider tires suitable for dirt/gravel roads. The wheels though have typical 20 mm wide rims. What's the widest tire I can safely put on these and do I match the inner tubes with the tire width or use something narrower?
    Thanks!

  2. #2
    Have bike, will travel Barrettscv's Avatar
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    You should have no problem fitting a 35mm wide tire. Just check that the rims have a hook on the inside of the rim. If the rim does not have a hook to hold the tire bead, you will need to use a rigid tire with a steel cable bead.
    When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.

  3. #3
    coprolite fietsbob's Avatar
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    on the dirt, even 2" tires have worked... For race MTB gear the narrow rims are lighter,,

  4. #4
    Senior Member GrayJay's Avatar
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    The hot setup for MTB wheels back in early 90's was 20mm wide MA-40 road rims that Bontrager rolled down to 26" size. No trouble with 2"+ tires. Wider rims will give the tires a bit more volume but really no fitment issue with any CX tire on a 20mm rim.

    700x25c tubes work fine for 35mm CX tires if you have them. Just avoid using really narrow tubes labeled for 18-21mm and you will be fine.

  5. #5
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