…Y 186 mph 300 km/h Exotic Sports Cars 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…
…deflect quicker, and increasing vehicle load will cause the tires to deflect farther (if tire pressure isn't increased). Consider that a 225/45R17 91W Standard Load tire (with a 25-inch overall diameter) will roll about 835 times every mile. Although the number of tire revolutions per mile doesn't…
…tire manufacturers started testing at 168 mph (W-speed rating) and 186 mph (Y-speed rating). In the above picture you'll see 91W to the right of the size. The W of the 91W means the above Yokohama Advan Neova is W-speed rated. Since Z means 149+ mph, any W- or Y-speed rated tire is Z-speed rated.…
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