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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 must not fall below the legal minimum. The tread is that part of the tyre in contact with the road in normal conditions. The minimum depth of tread depends on the class of vehicle.yres must be correctly inflated to the vehicle manufacturer's and the tyre manufacturer's recommended pressure. If you drive with damaged or worn tyres you risk being fined. You risk invalidating your car insurance policy and endangering lives too.