If you’re in the market for new tires, one of the first things you’ll need to do is identify the correct tire size for your car. In fact, choosing the wrong tires for your car could impact optimal vehicle performance and safety. Fortunately, it’s rather simple to identify what tire size you need. Your car’s original tire size can be found in the owner’s manual and on the vehicle's tire information placard (located on the driver's side door jamb), but you can also check your current tire’s sidewall. The sidewalls of your tires provide information about your tires dimensions, load index and operational purpose.
The markings on your tires can be broken down to understand your tires size and features.
Let’s break a popular passenger tire size down to find out what those letters and numbers mean: