Tire Type Knowing what type od tire you need is a big thing to remember. Having this know how can come from years of buying tires, or by simply asking your local tire salesman. Tires are made by the style of driving, whether it be for speed or distance driving, wet, dry or all season weather conditions. If you live in Florida, you will want a superior wet driving tire, with a dash of all season grip. For those northern climates you will want a tire that has great snow/sleet rating. Having the right style of tire will save you time, money, and costly repairs. Tire Size Knowing your tire size can save you time and help you to make an informed purchase. Your vehicle's original tire size can be found in your owner's manual or on the tire label located on the driver's doorjamb, glove box lid, or inside the fuel hatch. Tire Width: The three-digit number refers to the overall width of the tire in millimeters. Aspect Ratio: The relationship between the tire height and width. In this example, the tire height is approximately 60% of the tire width. Radial: The letter "R" indicates a radial construction of the carcass plies. The carcass plies run across the tire from lip to lip, helping to provide strength, stability, flexibility, and ride comfort. Wheel Diameter: The number indicates that this tire fits on a wheel with a 16-inch diameter. Load Index: The load index can range from 0 to 279 and indicates how much weight the tire is certified to carry at maximum inflation pressure. Never buy a tire with a lower load index than your vehicle's original tire. Speed Rating*: The speed rating tells you the top speed at which the tire can operate. Speed ratings range from Q (lowest) to Z (highest) with one exception: the H rating falls between U and V.To maintain the speed capabililty of a vehicle, use replacement tires with ratings equal or greater than those of the original tires. Mud & Snow: The letters M and S indicate that this tire meets the Rubber Manufacturer's Association's standards for a mud and snow tire. The letters can be found in the following combinations: M+S, M/S, and M&S. All-season tires carry this mark. Tire Mixing (if buying fewer than four tires) For front or rear wheel drive vehicles, we recommend mounting the new tires on the rear axle to prevent an unstable oversteer condition. When purchasing a single new tire, it should be paired on the rear axle with the tire having the greatest remaining tread depth. If you must use radial tires with bias-ply tires on the same vehicle (not recommended), the radial tires must always be placed on the rear axle. Never mix radial and bias-ply tires on the same axle.