[nikos2002]

Those are Losi Taper Pins. On the track Rob races on they actually grind the trend off and get more traction by the tire being a complete slick.

Now when I used to race on a track like that you needed all the wing you could get, because if you got off the line, you lost traction quickly, so the wing really helped. It is not uncommon to see the cars and trucks pull wheelies due to the traction when the conditions are right.