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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.
How to check your tyre tread depth: A quick visual check of tread depth can be made by looking at the wear indicators which youâll find in the grooves of the tread pattern. This will give you a guide as to how close a tyre is to the legal limit.A tyre should be changed before the tread reaches the level of the depth indicator but ideally at 3mm. tyre with 1.6mm can take nearly 50% further to stop a car in the wet compared to a new tyre with 8mm of tread depth. TOP TIP: Driving with tyres below the 1.6mm limit is not only an MOT failure but also illegal.