Bike Forums - View Single Post - Can all 700c rims accomodate a 700x32c tire?
Old 06-23-09, 05:31 PM
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tatfiend 
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Measure the inside width between the beaded edges of the rim. If 14 mm or less then a 28mm tire is the widest normally recommended. If wider then a 32mm tire is fine. ISO/ETRTO recommendations are the tire should be 1.45x to 2x the rim bead width normally though people do regularly exceed the recommendations at both ends. Too wide a tire may not be adequately supported by the rim, givin a wierd feel when cornering, and too narrow a tire for the rim risks pinch flats.

The other thing to check is the frame clearance both at the front of the chainstays and at the seatstay cross brace/rear brake mount to make sure the frame has clearance for the wider tires. In front check clearances at the top of the fork, both vertically and side to side. Many road frames and true track frames do not have adequate clearances for appreciably wider tires.
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