Originally Posted by
Geo Cruise
Also my current rims are 20mm wide with 25c tires on them, I have been looking at 36 spoke wheels with XT hubs and they are 25.4mm it that too wide to put a 28mm Tire on? Would it cause the tire to be more prone to failure?
The Chart is on this page:
http://www.sheldonbrown.com/tire-sizing.html
Your current rims are probably fine, but 25mm will be too wide. Note that this chart is interior dimensions, though most folk measure the exterior. Also note the note that wider tires on narrower rims are often fine. I don't believe the opposite is the case.