Tire Glossary
Style
Speed Ratings:
Tire Size Conversion Chart:
Speed Ratings:
* In laboratory tests that relate directly to highway speeds.
Reminder: Actual tire speed and performance capability depends on factors such as inflation pressure, load, tire condition, wear and driving conditions.
** Although no upper limit speed is specified here, the indicated tires nonetheless have limited rated speed capability. Call 1-800-367-3872 (USA only) for a referral for more technical information.
*** Any tire with a speed capability above 149 mph (240 kph) can, at the tire manufacturer's option, include a "Z" in the size designation (120/70ZR17). If a service description IS NOT included, the tire manufacturer must be consulted for the maximum speed capability. If a service description is included with the size description, the speed capability is limited by the speed symbol in the service description.
Tire Size Conversion Chart:
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