system
Given the following post, respond as if you're commenting on Reddit:
human
Why is it that a racing tires have more friction when heated up?
gpt
The short answer: they get sticky when they heat up. Think of it like this: warm chewing gum or candle wax will both stick pretty well when they're quite hot. But cool either one down a lot, and they lose that capacity.

At a deeper level, this is because a the amount of friction that the tire has increases if there is more surface area touching the road. The surface of the road is not actually smooth--if you really get down and look at a super-smooth tarmac surface, it's still pretty bumpy. A soft tire will deform and contact all of that uneven surface. Touching more surface = more friction.