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Freewheel
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==Advantages and disadvantages== By its nature, a freewheel mechanism acts as an automatic [[clutch]], making it possible to change gears in a manual [[gearbox]], either up- or downshifting, without depressing the clutch pedal, limiting the use of the manual clutch to starting from standstill or stopping. The Saab freewheel can be engaged or disengaged by the driver by respectively pushing or pulling a lever. This locks or unlocks the main shaft with the freewheel hub. A freewheel also produces slightly better [[Fuel economy in automobiles|fuel economy]] on carbureted engines (without fuel turn-off on engine brake) and less wear on the manual clutch, but leads to more wear on the [[brake]]s as there is no longer any ability to perform [[engine braking]]. This may make freewheel transmissions dangerous for use on [[truck]]s and [[automobile]]s driven in [[mountain]]ous regions, as prolonged and continuous application of [[brake]]s to limit vehicle speed soon leads to brake-system overheating followed shortly by total failure.
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