Quote:
Originally Posted by MechEngVT
Sidewall stiffness, internal friction. Anything that prevents the tire from deforming as it contacts the ground will reduce rolling resistance. Harder compound materials do this by reducing how completely the rubber fills the "roughness" of the ground surface. A stiffer carcass (the guts underneath the rubber and tread) will deform less for a given load/pressure and generate less internal friction. Higher air pressure is just one method for reducing carcass deformation.
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to a point. if you get runflats that are super stiff they suck for FE. I lost 1 whole mpg