Tire sizes and ratings: ... which appears on nearly every tire regardless of the type of car it’s installed on. ... On the bottom end of the chart, an R-rated tire is certified for up to 106 mph.

And the 15 is the size of the wheel it's designed for. So, in this case you've got a 31-inch tall tire for a 15-inch wheel. You know the wheel radius is 7.5-inches, and the tire radius is 15.5 inches.

On your example P235/70R15 tire, the P designates it as a standard passenger-car tire, 235 is the section width, 70 is the aspect ratio, R means the tire is of radial construction, and 15 is the ...

If you’re considering alternative fuel vehicles, you likely have an overarching question: Is it better to buy a hybrid or an electric car? Choosing the best option is your decision because ...

Vredestein's U.S. division kindly sent me a set of Wintrac Pros for my 2007 Porsche Boxster, measuring 205/50R-17 up front, 245/45R-17 in the rear. I've been running them since December. Here in ...