250cc dirtbike

How Fast Is A 60cc Dirt Bike? Engine Size Possible Top Speed 40cc 15-22mph 50cc 25-40mph 60cc25-45mph 70cc 30-50mph What size dirt bike is the fastest? Honda XR (177 km/h – 110 mph) – 650cc. … Husqvarna TX (180 km/h – 112 mph) – 300cc. … Aprilia RXV 5.5 (182 km/h – 113 mph) –