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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.
The tread depth groove in the tyres will tell you when your tyres are at the bare legal minimum of 1.6mm, ideally you should change your tyres earlier. The best way to check you tread depth is to buy a tread depth gauge.The gauge will give you the exact amount of tread remaining and will a lot more accurate.ost tyres now also have a depth indicator as shown in the picture above. The depth indicator is placed around the tyre within the groove. This is an easy way to check your tread depth. Once this groove indicator levels off with the top the tread the tyres are at 1.6mm.