Modern motorcycles

Motorcycle frames are usually made from steel pipes, while bottom there are two tubes, which is fastened to the engine. For greater comfort of the rider and improve the stability of the bike both wheels equipped with shock absorbers.
Like motorcycle engines use a two -, three-and four-cylinder petrol engines working volume which varies from 50 cm to 1200 cm 3 and higher. As a rule, these four-stroke engines, that is, each cylinder delivers the power once every two revolutions of the engine. Two-stroke engines, where each cylinder delivers power at every revolution of the engine, can be seen on cheaper models General purpose. Engines can be cooled by air or water. Usually transmission connected to the wheels through a drive chain, but in some more expensive bikes might be used instead the drive shaft.
Some motorcycles are driven by a rotary-piston engines. Especially for cities released a few small models with an electric drive.