Two-wheel drive | Wikipedia audio article


Two-wheel drive (2WD) describes vehicles with
a drivetrain that allows two wheels to receive power from the engine simultaneously.==Four-wheeled vehicles==
For four-wheeled vehicles (and by extension, vehicles with six, eight, or more wheels)
this term is used to describe vehicles that are able to power at most two wheels, referred
to as either front or rear-wheel drive. The term 4×2 is also used, to denote four
total wheels with two being driven. Most road vehicles use a 2WD layout due to
its light weight and simplicity. Traction on the road is usually sufficient
that the driving force can be reliably transmitted through only two wheels. For vehicles that have part-time four-wheel
drive, the term refers to the mode when 4WD is deactivated and power is applied to only
two wheels.==Two-wheeled vehicles==For two-wheeled vehicles such as motorcycles
and bicycles, the term is used to describe vehicles which can power the front as well
as the back wheel. The term 2×2 is also used to denote two total
wheels with both being driven. 2×2 vehicles are typically either mechanically
driven via chain or shaft or are hydraulic driven. This scheme greatly improves offroad performance,
but is quite complicated and requires more power to operate, thus most 2WD machines are
either “exotic” bikes for enthusiasts or created with special uses in mind. Manufacturers who have one in production include
Rokon and Christini. Manufacturers who are working or have worked
on a prototype include ZID, Suzuki, Yamaha, KTM, and Honda.==Two-wheeled drive with sidecars==
For three-wheeled vehicles such as motorcycles with sidecars, the term is used to describe
vehicles which can power the sidecar as well as the back wheel. Sidecar-drive vehicles are typically mechanically
driven via a shaft and may or may not have a differential. This scheme greatly improves offroad performance,
but is more complicated and requires more power to operate, thus most 2WD machines are
vehicles created with special uses in mind such as trials or military use. The first use of sidecar drive appears in
1928 with the apparent independent invention of Baughan in the UK, and Mokharov in the
USSR.==External links==
A brief history of 2×2 motorcycles KTM shows a new all-wheel-drive motorcycle
under development Christini All Wheel Drive Motorcycles
The Dryvtech 2x2x2 Experimental, a 2×2 motorcycle with two-wheel steering

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