A tyre treadwear rating grade is a comparative index established by the American Government to give consumers a guide to the wear rate of the tyre when tested under controlled conditions, for example:

A tyre graded 150 would wear one-and-half times as well in controlled conditions as a tyre graded 100.

The American Government requires a Treadwear Rating Guide to be moulded on every tyre's sidewall.

In the UK, tyres do not (by law) need to have a Treadwear Rating Guide on tyre sidewalls.

Valuetyres.co.uk staff will answer any questions you have about tyre treadlife.