Slick tires have the best grip, but only if the road is dry. When it starts to rain, those slick tires cannot displace water fast enough, it accumulates in front of the tire, and they start aquaplaning. If the tire have grooves, water can displace to them, and it doesn’t accumulate in front of the tire.
In F1, they use slick tires because they have the best grip, but when it starts to rain, they change to wet tires. In fact, F1 teams study when to change from dry to wets (and viceversa), taking into account how much water is there on the track, how much is raining, and how much (and for how long) will rain.
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