…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…
…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…
…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.
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