Chainring lockring tools from Park Tool. Fits Shimano STEPS E6100, E7000, E8000 and E9000 e-bike motor systems. For lockrings with 54mm outside diameter with 16 notches. Replacement for Shimano TL-FC39 tool. 36mm hex drive to be used with Park Tool TWB-36 Crow Foot and a torque wrench to properly measure torque.
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