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how it works
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System of bicycle gears consisting of multiple sprockets ,a chain and a mechanism to move the chain to the correct sprocket. (10)
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For more on marking an answer as the "Best Answer", please visit our FAQ.Basically, there is a metal adjuster cage that sits over the chain, (stick your thumb and forefinger straight out and iminge the chain running between them). When you adjust the gear lever, this cage moves sideways and physically pushes the chain from one size sprocket to another whilst you are pedalling). More here.