This is a custom wheel for the OpenRC Formula 1 car by Barspin: http://www.thingiverse.com/thing:1193309
This wheel is sized up by 13mm in diameter (25% increase), which causes it to clip about 1mm on the back of the rear chassie. I'd recommend to sand off the necessary area to fit the wheels.
There are 2 versions of the wheel, firm and soft. The difference is in how many spokes there are that make up the tire.
The "spokes" in the tire are designed to absorb impacts by allowing the tire to bend inward under stress. You should print this object in TPU or some other flexible filament for proper functionality.
Make sure you print this in TPU or another flexible material so it will actually work correctly and orient it so that the smallest dimension is upright (aka. have it flat).