examples of motorcycles 
Motorcycle designed for traveling over rough terrain, with features such as a raised engine, extended suspension, elevated muffler and tires with studs.
telescopic front fork
Pair of sliding tubes enclosing a spring; it controls steering, suspension and shock absorption on the front wheel.
Usually leather seat where the driver sits.
knobby tread tire
Tire whose tread is fitted with blocks of rubber, providing better traction on rough terrain.