Smooth Tyres for racing cars?

CAR tyres act as cushions for the wheels and give the car a good grip on the road preventing it from skidding while turning corners or when the brake is applied.

A smooth tyre grips the road far better than a treaded tyre, so racing cars are fitted with smooth tyres.

Non-racing cars could have smooth tyres too if they were to move only on dry roads, like racing cars. But as they have to move on all sorts of roads including wet ones they need treaded tyres.