Most beginning cyclists don't think too much about tires; they are basically just a rubber hoop that helps you grip the road, right? That might have been correct 30 years ago, but in the modern world, road bike tires come in a wide variety of sizes and styles, designed to provide very high performance in certain situations. This guide will help you make an informed decision about purchasing the right tires for your bike and your style of riding.
The first decision you will have to make about a tire is the size. This has to be matched with two things: the diameter and width of your wheel rims. You will also have to make sure that whatever wheel/tire combo you select can fit in the frame of your bike. A too-big wheel on a frame designed for narrower designs can cause problems.