I borrowed this from the Pbase page. I like the little bit of yellow paint on each wheel. I may replicate this

Looks like its marking the valve stem.

correct - the factory also did it on the Monte Carlo GTs

they also colour-marked the position of the jack holes

Monte GT

Monte GT

Gustl

Yes.

On the 911 racecar, we initially marked the tires where the valve stem is until we realized that the tires actually spin on the rim (!) at takeoff (and maybe even under hard braking).


We then switched to marking the rims similar to the picture above ...