Universal Black Motorcycle Chain Tensioner - Chain Ajuster - for Motocross Chopper ATV Dirt Street Bike Material: Aluminum + Rubber The chain tensioner is best for your chopper project! This tensioner automatically adjusts while you ride via a very powerful torsion spring in which the tension is fully adjustable. Universal fit most motorcycle. Please measure Motorcycle frame own clip tube 's specifications before bidding, to get the most appropriate specifications tensioner.