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The tyre load rating you need depends on the weight of your vehicle. And the maximum load that the tyres will carry.
You can find the recommended tyre size for a vehicle, including the load rating required, in your vehicle handbook. Alternatively you can contact the vehicle manufacturer for further information.
Tyre load ratings are indicated by a number on the sidewall of a tyre. This corresponds to the maximum load that the tyre can carry at its optimal tyre inflation pressure.
The load rating is a two or three digit number. The higher the number, the greater the load capacity.