Consult the tire manufacturer for maximum speed when there is no service description. For tires having a maximum speed capability above 300 km/h (186 mph), a “ZR” must appear in the size designation. When “ZR” appears in the size designation with the service description, the maximum speed is as indicated by the service description:įor tires having a maximum speed capability above 240 km/h (149 mph), a “ZR” may appear in the size designation. In the latest attempt to standardize tire designations, all ratings except Unlimited ZR incorporate the speed symbol and load index as the tire’s service description. Speed rating is identified as a part of the tire’s sizing or service description. Passenger cars and light-duty trucks generally have numbers that range from. A tire load rating index is an assigned number ranging from 1 to 279 that corresponds to the load-carrying capacity of a tire. ![]() W and Y limited speed symbols have been added as higher speed categories.Īlways consult the manufacturer for the maximum speed of Unlimited Z tires. You can use the Tire Finder (above) to find the Original Equipment tire size, tire load rating index, and a tire speed rating for your vehicle. The Limited V category of 250 km/h (149 mph) was then created, and the Z speed rating was added as the top speed rating that a tire could achieve. When this speed rating system was originally developed, the Unlimited V category of over 210 km/h (130 mph) was the top speed rating a tire could achieve.Īs manufacturers made more tires that did not fit this category, it was necessary to better regulate performance at standardized speeds to ensure safety. It does not indicate the total performance capability of a tire. (See our complete guide to tires to find the best tire for your car, SUV, or truck.) Winter/snow tires are excluded from UTQG, but all-weather, all-terrain, and all-season tires have UTQG ratings. This rating system, listed below, describes the top speed for which a tire is certified. Get to know your tire speed rating Speed ratings are given letters, and each letter represents a speed between 75-186 mph. A letter from A to Z symbolizes a tire’s certified speed rating, ranging from 5 km/h (3mph) to above 300 km/h (186 mph). The speed rating system used today was developed in Europe in response to the need to control the safe performance of tires at standardized speeds. ![]() The speed rating of a tire indicates the speed category (or range of speeds) at which the tire can carry a load under specified service conditions.
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