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Rapidé Tension-R Single Speed Chain Tensioner
If you have a geared bike that you want to run as a singlespeed the Rapidé Tension-R Chain Tensioner is just what you need! It will take up the slack in the chain using a sprung arm and jockey wheel and takes the place of the rear derailleur.
The jockey wheel is adjustable side-to-side for chain position making it easy to get the correct chain line and the compact internal tension spring makes for stiffer, flex-free chain alignment and control.