Quote:
Originally Posted by Phase
Can someone explain the difference in fuel economy of a 15 inch rim but a thicker tire versus a 17 inch rim but skinnier tire? Both would be the same diameter top to bottom
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The problem here is that tire size doesn't have as much effect as the tread rubber does.
Put another way, the variation between tires of the same size is way, way bigger than the difference between tire sizes. upwards of 50% difference versus single digit percent.
I go into more detail here:
Barry's Tire Tech:
Rolling Resistance and Fuel Economy (Continued)