Dear Car Talk: Can you tell me why tire sizes are designated as they are? If I understand correctly, we have metric, English and a ratio. Like, a “235-75R15” tire is 235 millimeters wide, has a ...

Many drivers give little thought to the sizes of their wheels and tires except for cosmetic purposes. But, wheel size — and the size of tires you put on them — matter. Using improper tires can be ...

The ’82 Jeep Scrambler came standard with a 205/75R15 tire. That works out to 27 inches tall. Optional 235/75R15 tires bumped the overall diameter to just shy of 29 inches. But when Robert Johnson ...