Quote:
Originally Posted by CapriRacer
... All other things being equal, a wider tire is better for rolling resistance ... The biggest problem is that very rarely are all things equal....
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That's the problem alright. As the links you posted offer, there are four variables here (atleast). I'm certainly not about to put a 215 width tire on my car instead of a 175 and suffer an aero penalty unless I also take into account the publicly available "data" of weight, LRR reputation, and wheel face design (smooth or turbine?) for that 215 width tire/wheel combo.