• If you've got a 15mm or wider rim they'll be fine according to sheldon. A 15mm run will run 23-32mm. you may get away with 32 on 13mm but that advice is worth what you paid for it ;)

    http://sheldonbrown.com/tire-sizing.html

    If you are running 23mm you may not have enough frame clearance to run 32mm.

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