DaveT319
Marquez FTW
Friction creates heat, and tires warm once you begin riding. The few pro races I've seen, when the riders get up and take tire warmers off they immediately start weaving. I know street tires warm fast and don't necessarily have to be warm but I would rather be safe.
This is NOT to warm up the tires; it's to scrub them in a bit. When they first get going on a brand new tire, they do that to rough up the rubber a bit. And when they are coming back from the warmup lap, they are doing it to scrub off the debris that they might have picked up, because they usually don't stick to the racing line on the warmup lap, so they pick up little bits of dirt and rubber that as they are coming to the line they clean off by weaving.
It doesn't do shit to warm the tires. Braking and accelerating do that.





.. I have even taken training classes where this practice is still done.