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Tyre Speed Rating

Speed index
Speed index determines the maximum speed allowed for the given type of tyres. It must match the specification of the vehicle’s producer and the load index. Both values are given on every tyre – please check the tyre sidewall markings. Click here to learn how to read tyre markings.
SymbolSpeed
[mph]
Speed
[kmh]
A135
A2610
A3915
A41220
A51625
A61930
A72235
A82540
B3150
C3760
D4065
E4470
F5080
G5690
J62100
SymbolSpeed
[mph]
Speed
[kmh]
K68110
L75120
M81130
N87140
P93150
Q99160
R106170
S112180
T118190
U124200
H130210
V149240
W168270
Y186300
  • When using tyres with a Q index you should not exceed a speed of 99 mph (160 kmh).
  • For VR category tyres the maximum load is provided for a speed of 130 mph (210 kmh).
  • For ZR category tyres, the maximum load is provided for a speed of 149 mph (240 kmh).
  • For tyres with V index, the load index should be reduced by 3% for every 6 mph (10 kmh) for speed range from 130 to 149 mph (210 to 240 kmh).
  • For tyres with W index, the load capacity should be reduced by 5% for every 6 mph (10 kmh) for speed range from 149 to 168 mph (240 to 270 kmh).
  • For tyres with Y index, the load capacity should be reduced by 5% for every 6 mph (10 kmh) for speed range from 168 to 186 mph (270 to 300 kmh).

Speed index

Why Are Tyre Speed Ratings Important?

When it comes to keeping your car in a roadworthy condition, car tyre speed ratings are very important. It is this speed index that determines the top tyre speed and, typically, manufacturer’s carefully select this to match the top performance of your vehicle.

It doesn’t matter, for instance, if your vehicle has a higher speed than the national driving limit of 70 mph. The car itself is capable of driving at faster speeds and, for safety reasons, you should have tyres that can handle the corresponding forces.

Furthermore, it is not permitted to drive at speeds higher than your tyre speed rating, as this can lead to serious accidents on the road. There may be some situations, for instance, where a vehicle has a speed rating below 70 mph - although this is rarely the case with modern vehicles. In such an event, you would have to drive within the tyre’s limits.

Similarly, you cannot equip tyres with a speed index lower than what has been outlined by the vehicle’s manufacturer. On the other hand, you also cannot have a tyre with a rating more than 2 levels higher than the advised index.

Because of these factors, your best option is often to stick with the advised ratings given in the vehicle’s manual. Our tyre speed rating chart allows you to easily achieve this, showing you what each tyre rating is capable of in terms of speed.