There are also specialized monster size 2-stroke engines such as the MTH 630, and 685cc Zabel which are made just for Sidecar Motocross racing. The Zabel and MTH are the top engines in the World Championship. Racing is done on the same outdoor motocross tracks as regular motocross.
Sidecars can handle rough terrain including bumps, turns, hills, mud, and jumps.
The driver handles the bike similar to a regular motocross bike, except the bike doesn't lean in the turns. The job of the passenger is to move his weight around to help go faster in turns and jumps. The passenger does much more physical work than the driver since he moves his whole body around continuously. Excellent physical conditioning is required for both the driver and passenger. The best sidecar teams in the world have been racing together for many years, and work well as a team.