Reverse colab chain tensioner

- on bike park rides riders often don't need the complexity of a delicate rear derailleur setup - the reverse chain tensioner in combination with the reverse singlespeed kit makes it possible to keep things simple quiet and smooth all season long - the chain tensioner installs on the derailleur hanger and the chain runs through the jockey wheels for a tight smooth and secure setup - material: aluminium - chainline adjustment possible - on bike park rides riders often don't need the complexity of a delicate rear derailleur setup - the reverse chain tensioner in combination w