Manual transmission. Most bike transmissions are manual sequential gearboxes, with neutral positioned between first and second. After second gear each gear can only be used in order. Reverse is only fitted to the largest touring bikes like the Honda GoldWing.
Automatic transmissions can be found in many scooters and some touring bikes.
Chain drive is the most common form of transmission to get power from the gearbox to the rear wheel. Chains require regular maintenance and lubrication. They also require periodical adjustment and change because of the stretching incurred over time.
Shaft drive is found on many touring bikes and BMW uses them on many of their models. Shaft drive units are completely enclosed and almost maintenance free, quiet and clean. Shaft drives drain power from the engine because of the complicated gearing required, they are also heavier than chains or belts.
Belt drive is found on many Buell bikes among others. Belts are quiet, clean and efficient although they do stretch over time like a chain. Belts are limited in the amount of power they can handle.
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