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| Frame |
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This is the structure that supports the body of a vehicle and the suspensions. In vehicles with a self-supporting chassis. the chassis can be the body itself or be divided in two parts. a chassis on the front suspension and another on the rear suspension. On bikes the metallic structure which holds the bike�s parts (crankcase. swingarm. wheels. engine etc.) is known in this way. Its most important function is to keep the front and rear suspensions in place.
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| Free height |
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The distance between the lower part of the vehicle and the floor.
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| Free wheel |
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This is a device responsible for disconnecting the transmission when the engine has no traction. It is used on starter motors or on the rear sprocket of a bicycle. If it used on vehicles the engine brake could not be used as it would be disconnected from the transmission when it stopped giving up energy.
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