ANSWERS: 1
  • The speed rating is the maximum service speed of a passenger car tire. Light truck/SUV tires are not speed rated. Here is a list of rating indicators and their mile-per-hour equivalents. This rating system applies to all tire makers. Rating Maximum Speed Q 99 mph S 112 mph T 118 mph U 124 mph H 130 mph V 149 mph W 168 mph Y 186 mph Z Above 149 mph Z doesn't seem to make much sense according to this chart, but that is how it was listed where I found this answer. Perhaps somebody else here can explain this. I hope this helps though.

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