Speed Index

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Speed Index
Related Categories: 91w | What Does Z Mean On The Tires | Q Speed Rating | Trailer Tire Load Range Chart | R Speed Rating | Zr Meaning | Speed Rating Chart | Winter Tire Speed Rating | Meaning Of Tire Ratings | Speed Rating
  • Tire Speed Ratings

  • …the tire manufacturers. Tire speed ratings were established to make sure speed capabilities between tire and vehicle were in agreement. Meaning, the vehicle should only go as fast as the lowest speed rated tire on it. Read "How to Read Speed Rating, Load Index & Service Descriptions"…

  • Understanding Speed Ratings

  • …maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed. You can learn more about speed rating and the other letters and numbers on the sidewall of your tire in "How to Read Speed Rating, Load Index &…

  • Related Products: 91w | Q Speed Rating | R Speed Rating
  • What Does "ZR" Mean?

  • …little bit about speed ratings. Speed 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 Does 'XL' Stand For?

  • …two tires per axle, the tire load rating must be at least half of the GAWR. The vehicle placard will also list the service description of the original tires. To learn more about tire service descriptions, take a look at "How to Read Speed Ratings, Load Index, & Service Descriptions."


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