Originally Posted by
bobn
I still can't see how putting more rubber on the road lowers the rolling resistance. It would seem to me that wider tread would create more friction than a skinny hardily touching the road tread, thus making it harder to keep in motion?
Rubber on the road does not create rolling resistance. *Flexing* of the tire to put rubber on the road does. If you have a 100psi tire supporting 100#, then the tire must flex enough to put 1 square inch of rubber on the road. A narrow tire must flex more than a wide tire in order to do that.