While driving regularly, the tread depth starts to wear down. Another reason for wearing tread depth is rash driving affecting the tyres. A coin test is a test done by people on the tyres to understand if the tread depth of the tyre is correct or not. Insert a one rupee coin in the grooves of the tyre. If the maximum part of the coin gets inside the grooves, then you have an adequate tread depth. If you are able to see only the outer line of the coin, it means that you should get your tyres replaced as they are not safe to drive with.
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