Why all the changes? Dirt bike racing takes place on tracks made of, well, dirt, which includes a lot of uphill and downhill riding and bouncing around. Supermoto races, on the other hand ...

They were initially made for supermoto races (which combined three different kinds of terrain: paved roads, motocross-like obstacles, and flat-track hard-packed dirt), but street-legal models ...

The GP World Cup feeds off the burgeoning popularity of sub-500cc twin-cylinder motorcycles ridden at kart tracks such as the ...