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…shows up at the beginning of the size, and the "R" right before the wheel size, for example P245/40R18 or LT315/70R17. But what does it mean when the tire says "P245/40ZR18"? For that, you need to know a little bit about speed ratings. Speed ratings on tires are expressed in…
…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. You've got Z-speed rated tires after all.
…of the jargon means. For example O.E. stands for Original Equipment and Ser. Des. means service description. Other abbreviations associated with tires include: * PSI = pounds per square inch* AS = all-season* M+S = mud and snow* SL = standard load* ASY = asymetrical tread design* ZR = Z speed rating…
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