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They help to displace water to keep your car from Aquaplaning.

To get the most friction and therefore the best braking effect, the more area in contact with the road, the better. On a dry road, slick tyres would be best.

But if you tried this in the rain you would Aquaplane, when the water would form a barrier beween the tyre and the road and give no grip.

So the grooves are only of use on wet roads. It is a legal requirement to have at leasy 1.6mm of tread groove, on tyres in the UK.

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Q: How do the grooves on the tires help a car in braking?
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How do I know when to change the tires on a car?

You should change tires when you look at the grooves and they are ground pretty smooth. You want grooves in your tire so that it has good traction. If you put a nickel in-between your grooves and it doesn't stick out, then your tires are still good.


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