no. 9: static rims

I know they make spinning rims for cars, but why not make ones that never spin, no matter how fast the car is going. I'm not sure the mechanics of most rims, but I feel all it would take is a rim that is connected to an axel, but is weighted on the bottom so that no matter how fast the axel spins, the weighted part of the rim stays on the bottom. Perhaps they already have this, but it seems cool (or relatively cooler than spinning rims)...