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Related Categories: Winter Tire Speed Rating | 91w | Speed Rating Letters | H V T Rating | Speed Rating Chart | R Speed Rating | 225 45zr17 | Lower Speed Rating | Speed Rating | Q Speed Rating
  • Understanding Speed Ratings

  • …in 245/45ZR17 or the "H" in 205/55R16 89H. This letter is the speed rating of the tire. Tires are tested in laboratory conditions under load by tire manufacturers to determine the maximum speed capability of the tire. Shown below is what the speed rating letter equates to in MPH.…


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