I am not an expert on tire design. I do understand the importance to getting horse power to the ground. I will try to give you my thoughts.
First think about water balloon rolling down a glass table and how quick it gets from one side of the table to the other as you apply force to push it from one side to the other.
Second think about a steel ball in the same diameter as the water balloon. Using the same force to push it from one side of the table to the other. Which one rolls quicker? Pretty easy to answer. The steel ball.
The object in racing is to get from point A to point B as quickly as possible. You need to be able to apply as much power to the ground without sacrificing any loss in the tires (of course there are other parts of the race car , but we are talking about tires).
Get 2 rubber bands. Both same diameter. One that is thin and very elastic. And the other that is stiffer,thicker, and tighter. Pull them back off your finger and shoot them across the room/ Which one has the ability to shoot farther? Yep the stiffer/tighter one.
Take these examples and think about the differences between a drag radial and a slick. Hope this helps you understand better.
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