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The 10T billet idler tensioner precision bearing sprocket with high end roller bearings for smooth spinning of the wheel. These can be used as a replacement to your stock nylon wheel or with the Kip Springer Chain tensioner. Either way a nice upgrade. Compatible with 415 heavy duty bicycle engine chains. Installation is a breeze: uninstall your idler roller from your chain idler pulley, replace with this idler sprocket, install your chain, and you're ready to roll Includes mounting hardware and spacer!