Spring Bearing Chain Idler Tensioner Adjustable Bracket Pulley Kit For 49cc 60cc 66cc 80cc Gas Engine Motorized Bicycle Parts Description: Tuning Spring Idler Pulley features a heavy duty spring to keep constant chain tension. No longer do you have to keep adjusting your idler to compensate for your chain stretching out. HEAVY DUTY SUPPORT: With a heavy duty spring, your chain is locked in place offering better alignment and constant tension. The bracket is thicker steel and a more sturdy design so that your chain is less stressed and can drastically extend the life of your chain. EASY INSTALATION: Just unbolt and remove your older idler pulley and bolt your new. No adjusting tension as the spring will keep it perfectly adjusted every time. Specification: -- Condition: 100% Brand New -- Material: Metal -- Color: As picture -- Quantity: 1 pc -- Size: As the picture shows Fitment: For 49cc 50cc 60cc 66cc 80cc Gas 2 Stroke Engine Motoriezd Bike Universal Fit: Compatible with 415 heavy duty bicycle engine chains, regular and spring chain tensioner. Works for both 2 stroke and 4 stroke motorized bicycle engines and most standard city bikes, cruisers bikes, beach cruisers, mountain bikes and road bikes. Note: Replacement for original part.Please check part comparibility to see if it fits your model. The measurement of the actual items may slightly different from the listing images due to manual measurement,please allow 0.5-1mm difference.Thanks for your understanding. Reminder/Note: To Ensure You Purchase the Correct Product, Please Read the Description Carefully. Thanks for Your Attention. Package include: 1 x Chain Tensioner Kit