The drivetrain of a motor vehicle is the group of components that deliver power to the driving wheels. This excludes the engine or motor that generates the power. In contrast, the powertrain is considered to include both the engine or motor and the drivetrain.
The market for drivetrain components is economically important and is estimated to reach US$314.4 billion by 2019. Market value by layout is approximately half for front-wheel drive, with a quarter each for rear-wheel drive (mostly in light commercial vehicles and trucks) and all-wheel drive.
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