The tread is for rain, ice, and snow which we need on the road because it could rain. Formula 1 also has treaded tires for rainy conditions. But when it’s dry they use smooth tires because there’s a bigger contact patch which then offers more grip. You could have smooth tires on your car as well but If you use the smooth tires on the rain, they would hydroplane. We keep the treaded tires on our car most for the convenience but also because they will still last for thousands of miles, even in dry conditions. F1 rain tires on a dry track get destroyed quickly and only last for about 10 miles.
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