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Old 07-11-2014, 06:11 PM   #17 (permalink)
freeside
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One factor is that larger diameter tires can increase vehicle height, thus potentially affecting aerodynamics by being higher off the road. This is one of the easiest ways to get more ground clearance on an off-road vehicle.
Typically smaller contact patch is better for off-road traction, and larger contact patch is better for on-road traction.

How that relates to rolling resistance is beyond me.
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