Never mix tires with different speed ratings, as this may cause serious handling problems. above 186 mph, a Z rating must appear in the size designation, including a Y speed symbol in brackets. The tire may be able to reach higher speeds, but traveling at speeds higher than 99 mph for any length of time would be unsafe - the tire is not designed to handle it.įor tires having a maximum speed capability above 149 mph, a Z rating may appear in the size designation. Tires with a Q speed rating can safely sustain speeds of up to 99 miles per hour. On the sidewall of every tire, you’ll find one of these speed rating codes: Manufacturers assign speed ratings to tires after extensive performance testing. ![]() ![]() Speed rating standards are established by the U.S. A higher speed rating will generally indicate that you will have better control and handling characteristics. ![]() The speed rating is a measure of what speed the tire can safely maintain for sustained periods of time.
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