freewheel

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freewheel

1. a ratchet device in the rear hub of a bicycle wheel that permits the wheel to rotate freely while the pedals are stationary
2. a device in the transmission of some vehicles that automatically disengages the drive shaft when it rotates more rapidly than the engine shaft, so that the drive shaft can turn freely
References in periodicals archive ?
For instance, I-See accelerates up hills, remains in a high gear for as long as possible and freewheels on descents to exploit the truck's weight as a propulsion motor.
With moderately long and steep slopes, I-See ensures that you can freewheel for long distances without using the engine," explains Anders Eriksson.
But in order to freewheel, a whole lot of data is required.