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Tyre Speed Rating

Tyre Speed Rating

The speed rating or speed index is represented by a letter and associated with the tyre’s maximum speed capability when operating at its maximum load carrying capacity. A tyre marked with a ‘Y’ speed rating, indicates it can be safely operated at a maximum speed of 300kph.

Speed Category Symbol Speed (km/h) Speed Category Symbol Speed (km/h) Speed Category Symbol Speed (km/h)
A840N140Z*Over 240
*Consult tyre manufacturer for Speed and Load Capacity

When the letters “ZR” are included in the tyre size and followed by a service description, the tyre speed category is that included by the service description.

Service Description Examples:
Tyre DescriptionMaximum Speed Capacity
225/55R 17 97W270kph
225/55ZR 17 97W270kph
255/40R 17 94W270kph
255/40ZR 17 (94)*Over 240kph*
*Only tyres V, W or Y are included in this category.

The tyre manufacturer must be consulted to ascertain the tyre’s maximum speed capability when the tyre has a “ZR” symbol and no service description. The “ZR” symbol must appear in the tyre size designation for tyres having a maximum speed capability of over 300kph.