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It is because there must be a friction between the tyres of an automobile and the road.it is for the same reason that special kinds of grooves are made in tyres so that they offer the required amount of friction.

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Q: Why do new automobile tires have deep grooves?
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When replacing car tires do width and ratio have to be the same as old tires?

The new tires have to match what the automobile manufacturer requires for that vehicle.


When do you change tires?

get a penny, and place it upside down (with Lincoln's head facing down) in one of the grooves. if you can see the top of the head its time to get new tires.


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Do you get new brakes or new tires first?

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