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Use a tread depth indicator or gauge. You can use a special tread depth indicator or gauge tool to measure your tire's tread. If you don't already own one, the gauge is cheap to purchase from an auto parts dealer and it's easy to use. You may be able to find a downloadable tread depth gauge by searching online.
Tread depth. The legal minimum tread depth of the main grooves of car and similar tyres in the United Kingdom and the European Community is 1.6mm. This applies across the central three quarters of the breadth of tread and round the entire outer circumference of the tyre.ost car type tyres have tread wear indicators, usually at least six small ribs across the bottom of the main tread grooves, and when the tread surface becomes level with these ribs the tyre is at the legal limit and must be replaced.