Derailleur
A gear-changing mechanism that allows the chain on the bike to be moved onto sprockets of differing sizes that are fitted to the rear hub of the cycle. It is operated by levers on the handlebars or down-tube.
A gear-changing mechanism that allows the chain on the bike to be moved onto sprockets of differing sizes that are fitted to the rear hub of the cycle. It is operated by levers on the handlebars or down-tube.
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