Join Date: Jul 2008
Location: Saint Louis, Missouri
Bikes: '09 Rodriguez Adventurer Custom, '08 Trek 7.3Fx
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Yea, car tires are much, much different. Cracking causes friction and heat in car tires, no true in bikes.
Low tread is a problem for both, but less of an issue for bikes, since they don't hydroplane, they just get flats more frequently. Small sidewall cuts aren't the end for a bike tire, unless the tube bulges through, but even those can usually be booted and used for awhile. Low PSI in cars can cause blow-outs and tread separation, for bikes you just risk a pinch flat, and accelerate wear.