The other important part of a tyre size is the load and speed rating. These take the form of two numbers and a letter i.e. 84T. The 84 is the load carrying capacity of the tyre, in this case 500 kg per tyre. This indicates that the overall weight of the car must not exceed 2000kg (500kg x 4 tyres). The T is the tyres maximum sustained speed code(see table).
Whilst it is not against the law to change the original specification, the speed rating of a tyre is usually used in relation to the performance of the car, therefore the original rating should be fitted in accordance with the car manufacturer's recommendation. Failure to do so could void any warranty or insurance claim.
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See Also:
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Tyre Sizes
- The Tyre Law