
Machines grows larger and larger, so the engine increasing the engine to maintain weight. If the heavier engine, wheels and tires are bigger and stronger to support weight, such as brakes, frames, etc. The fuel tank has been extended to provide greater engine fuel needed.
With the growing size of the engine, the motorcycle is faster and can travel longer distances. Higher speed means the addition of transmission. Driver comfort in the form of larger tires, suspension systems, chairs and so on are added to the trip better. Extra speed also makes the tire more important for performance, so that the wider tires.