The speed rating of a tire indicates the speed category (or range of speeds) at which the tire can carry a load under specified service conditions. The speed rating system used today was developed in Europe in response to the need to categorize tires into standardized speeds. A letter from A to Z symbolizes a tire's certified speed rating, ranging from 5km/h (3 mph) to above 300 km/h (186 mph). 

 Speed SymbolSpeed (mph)
  L 75
  M 81
  N 87
  P 94
  Q 100
  R 106
  S 112
  T 118
  U 124
  H 130
  V 149
  W 168
  Y 186
  (Y) Above 186
(Consult tire manufacturer)

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