Tire speed ratings
April 10th, 2009
What are “Z rated” Tires?
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.
Each tire has a letter rating to determine the top speed a tire can reach, before losing traction. The chart is as follows:
Posted By: Roberto Sebestyen
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