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The rear derailleur or 'mech' shifts the chain across the different sprockets on the cassette to achieve higher or lower gears. It is spring-loaded to take up chain slack.
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![SHIMANO RD-M592 DEORE SHADOW 9-SPEED SGS REAR DERAILLEUR [Expected Availability On 25/11/2020]*](http://www.allterraincycles.co.uk/Images/ExtraLarge/104547_10.jpg)
