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. 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. 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. This rating system, listed below, describes the top speed for which a tire is certified. ![]() 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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