Those fat, black, round things between the car and the road look much alike. Sure, some are wider or narrower, taller or squatter, but they are more similar than different to most people. No wonder ...

The numbers and letters on a car tire may seem confusing, but they're actually relatively simple once you understand them. Here's what they mean.

The tire market is a huge industry and, in many ways, it’s as diverse as the uses we have for our diesels. Mud-terrains allow the off-roader to navigate rugged terrain and provide a tough look.