bingo... aside from that with a 28" tire you're effectively dropping your gearing and losing effective torque. 28" tire is 28x3.1416 in circumference, a 26" tall tire is 26x3.1416 in circumference. For each 4.1 turns of your driveshaft your car has to move ~87.8" with a 28" tire, but with a 26" tire you only have to move the car 81.6". Using the same energy to do less work equals that work being done in less time.
Geez... cmon guys. This isn't hard to comprehend.
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