Off-road motorcycles are motorcycles designed for being ridden in rougher terrain. They are also known as "dirt bikes" and "trail bikes". An off-road motorcycle will typically have suspension with more travel than a road bike, higher ground clearance and hence a higher centre of gravity, and a small (less than 500 cc) single cylinder motor.
Competitive dirt bikes are optimized for speed trials, enduro (long distance racing), hill climbing, or timed-trials. Some authorities think that the competition that best reflects real-life needs is the timed trials, because they require a balance of maneuverability, speed, light weight and reliability.
Related to dirt bikes are dual-sport bikes which are street legal variants of dirt bikes with more suspension travel than a standard bike but having all the other equipment usually found on one.
A Derny is a specialized type of motorcycle designed and built for use in track cycling events where a derny driver blocks the air-resistance for a racing bicycle riding close behind the derny.
Motorcycles have a far higher rate of crippling and fatal accidents per unit distance than automobiles. This is due to the exposed rider and the fact that many automobile drivers fail to see these smaller vehicles in the traffic stream. In many developed countries riders are now either required or encouraged to attend safety classes in order to obtain a separate motorcycle driving license. The wearing of protective gear is also often mandated, especially Source | Copyright