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Assuming you're talking about the tyres... The tread on the tyres channels water away from the wheels - allowing the tyres to grip the road better than if the tyres were completely smooth.
Smooth tyres have less frictional grip on the road surface, and will slide further that a deep tread tyre.
Its so tyres have grip in the wet
The normal racing tyres are slick and have no tread. The intermediate tyre has a 2.5mm tread, and the full wet has a 5mm tread.
Slick tyres are tyres without tread. The tread is only there so that water can be pushed into it on a wet track. On a dry track no tread is needed and therefore you will get more contact with the road without it, allowing the cars to accelerate/brake/corner faster. Therefore slick tyres are used as they are faster in dry conditions.
It does not! In fact will DEcrease contact and therefore friction. A bald or smooth tyre will be best on dry surface. The purpose of tread on tyres is to sipe away water on wet road and a rough tread would act in similar manner though far less efficiently.
It is important to closely inspect the condition of the tyres. Looking for damage and splits, and to ensure the depth of the tyres' tread are legal or even better.
Bald tyres are tyres where the tread has been worn of in use and if this is the case then the tyres are not same (and illegal) to use. There are tyres made without a tread (for racing cars), these are not called bald tyres, they are called "slicks" and instead of a tread the surface of the tyre is made to be sticky in use.
the tyres could blow and you may lose controle of your car
No re-tread tyres can also bubble
rough tires get more traction thus, like sliding.
Poorly inflated tyres and unbalanced wheels and tracking.