mich800 wrote:
kellertx5er wrote:
What most people fail to realize about this issue is that there are rotational (centrifugal) forces acting on the tire structure. These forces increase with the SQUARE of the speed. So, while 70 mph vs 65 mph is only a 7.7% increase, the centrifugal forces increase by 16%. At 72 mph the increase is 22.7%.
Something to keep in mind when deciding how much is too much.
But why are all sizes of ST tires rated at 65 mph regardless of their diameter and thus different rotations per mile? Theoretically a 16" st tire should be working less than a 14" tire at the same load.
What you say is true, but tires are rated at their MAX load. A 16" ST tire can carry more load than a 14". Both are still rated at 65 mph at their respective maximum load. There are no published speed ratings for tires operating at less than max load.
