- 2,183
- Houston, TX
- Rosstickles
I haven't noticed it before, but then again didn't ever do an endurance race on a track that has variable weather. It looks like it is an indicator of how wet the track is, but I can't really tell.

It's a tire? Looks like a bucket..
You're looking at it the wrong way, is all. It's not a side-view of the tire - it's a cross-section, viewed from the front or rear. Sidewall "(", Tread "_", Sidewall ")" (_).