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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 wear levels. Because itâs the only part of the vehicle that grips the road, the depth of tread on your tyres is a very important for the safety of your vehicle.It also signals the health of the tyre.hen the tread surface is worn to the same level as these indicators, the tyre is at the legal limit and should be replaced. However you check your tyre tread depths, if they are approaching the legal limit or if you have any doubts, get them checked professionally by a tyre specialist.