- 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 - Chain line adjustment possible