Staying on top of tire maintenance is an important part of car ownership. Poorly maintained tires can lead to tire blowouts, loss of control, and other serious problems that could hurt you as well as other drivers on the road. However when the time comes to replace your tires there are a few things that you are going to want to know, such as your tire size. The easiest way to find out your current tire size is by looking at your tires. On the sidewall you will find a set of three numbers. The first number is three digits and it indicated the width of your tire . The second number is a ratio of your tires height and width followed by a letter that indicates the type of tire, such as an "R" for radial. The final set of numbers is your tires diameter. With this information you should be able to walk into any tire shop and have them show you which Bridgstone , Goodyear, or any other brand of tires will fit your vehicle. If you desire tires that are different from the ones you are currently using, the best place to consult is your vehicles owner manual. Inside you will find information on the size limits and maximum capacity your vehicle can take. If you don't have an owner's manual or would like more information, you can contact the dealership and they should be able to answer any of your questions. As a general rule, it is best not to go any smaller than the tires that came with your vehicle. It is also not a good idea to mix tire types, such as radial and non-radial tires , or tires that are in various stages of wear. Having good tires is an important part of safe driving, so it is always best to ask questions and make sure that you understand what is being put on your tires before you head back on the road.