…the tire's load index and speed rating. Service descriptions are required on all speed rated (except for Z-speed rated) tires manufactured since 1991. The first two digits (87S) represent the tire's load index and are followed by a single letter (87S) identifying the tire's speed rating.
While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.
Best Z Rated Tires found in: Longest-Wearing Z-Rated Performance Tires, Hankook Ventus V12 Evo Defeated by Sumitomo HTR Z III, Testing Value-Priced..
Tires with "Z" ratings were originally thought to be to the highest rated tires a vehicle would require. However, the development of faster vehicles led to the production of two new speed ratings, "W" and "Y.". These two ratings provide a better indicator of the tire's capacity for speeds higher than 149 MPH.
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These represent the tire’s ability to dissipate heat under controlled indoor test conditions. Any tire rated below C is considered unacceptable. 4. Icons. Some tires have unique benefits, as showcased with specific icons. The letters M and S (M +S) indicate that the tire meets the Rubber Manufacturers Association’s standards for a mud and snow tire.
Some manufacturers will insert a “Z” in the middle of the tire size description (right after the aspect ratio) when the tire is rated at “W” or “Y.” And if a tire is rated in excess of 186 mph (300 kph), manufacturer’s usually will list a “Z” within the size description, per industry standards.
…tire is tubeless * These cruiser motorcycle tires are Z rated for speeds up to 149+ mph Note: Wheel sold separately. Note: Tire sizes 110/90-19 and 3.25-19 are V rated for speeds up to 149 mph. Note: Tire size 110/70-17 is H rated for speeds up to 130 mph.
Recommended High Speed Pressure & Load Capacity Adjustments For Z-Speed Rated Tires (tire manufacturer must confirm speed capability beyond 149 mph ...
Automobile tires are described by an alphanumeric tire code (in American English and Canadian English) or tyre code (in British English, Australian English and others ...
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