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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.
    2014 Trek DS.1: "Viaggiatore" A do-it-all bike that is waiting in Italy
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    1997 Simoncini Special Cyclocross: "Little Simon" lugged Columbus steel CX bike
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  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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