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.

We’ll tell you how to crack the code so you can understand what tire sizes mean. ... You can also take a look at the tire size chart below, ... The diameter of the wheel (or rim) in inches. 92.

The tires’ size will be prominently listed on the sidewall. This is a string of letters and numbers that usually starts with “P.” For this example, we’ll use P215/55R17 tires, found on a ...

Using a P215/65R15-size tire as an example, we can tell that the tire is for a passenger vehicle and has a 215-millimeter width. On the right side of the slash symbol, you'll find two numbers, a ...

Consumer Reports deciphers the cryptic sidewall codes on a typical tire, explaining how to decode tire size, load index, maximum pressure, ... and 17 is the wheel diameter, in inches. more on tires.

For example, if the original stock tire size is 215/65R17 and you buy 18-inch wheels, the right tire size for the larger rims might be 225/55R18, with the differences being the larger-diameter ...

While a chart offers you an idea of what tire size your 4x4 could cycle, it doesn’t always answer the greater questions of what tire will work best for your axles, steering, and wheelbase.

Car Talk explains why tire sizes combine metric and English measurements with a ratio and how to get lug nuts off your car. RAY MAGLIOZZI. December 20, 2019. 4 minute read. comments. Dear Car ...

So, he was able to conclude that winter tires are great in general, but if you want ones that understeer slightly less, go for a wider diameter. For wet testing, the narrower, 16-inch tires ...

Last year, another Cybertruck prototype was spotted with larger asphalt-oriented tires. Measuring 315/60R20, they had the same diameter as the ones in this latest spotting.

Due to wheel size complications, sizes a, b and d were all thrown out as wheel and tyre brands settled on c as the best standard. Naturally, a 23mm tyre and a 30mm tyre will have a different ...