Features:1.Heavy duty chain roller tensioner is really suitable for 110cc 125cc 140cc dirt pit pro dirt bike 4 wheeler.2.Heavy duty chain roller tensioner with upgraded spring, thicker wire and longer travel, seamless steel bushing brings smooth rotoring and longer life.3.It ensures proper chain tension and alignment. It prevents the chain derailment, excess wearing of the sprocket and prolongs chain's life.4.If the bike don't have the proper chain tension, the chain will get lose or break, it will damage the side cover and the stator plate at last.5.15mm/0.59in inner diameter mounting bushing size, necessary for all serious riders, very useful and practical.6.It protects swing arm and helps guide chain correctly, the bracket use 3.1mm/0.12in thick metal, stronger built than other tensioners.Specification:Item Type: Heavy Duty Chain Roller TensionerMaterial: Steel Alloy + ABSMetal Thickness: Approx.3.1mm/0.12inInner Diameter Mounting Bushing Size: Approx. 15mm/0.59inColor: WhiteFitment: For 110cc 125cc 140cc Dirt Pit Pro Dirt Bike 4 wheeler