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Related Categories: What Does Z Mean On The Tires | Zr Meaning | 245 40 Zr 18 | Zr Speed Rated | Michelin Zr | What Does Lt Mean | Michelin Pilot Sport Zr | 97y | What Does Zr Mean | 245 40zr18
  • What Does "ZR" Mean?

  • …ratings on tires are expressed in letters and are generally listed along with the load index for a tire after the size, for instance 245/40R18 93H. 93 is a load index and the "H" is the speed rating. Together, the load index and speed rating make up what is called the service description.…


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