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Don't be a fool, go with Park Tool

Precisely machined for a perfect fit, this 8-notch tool removes and installs the lockring that retains front chainrings found on Bosch Gen 2 e-bike motors after the crank arm is removed.

Product details

  1. Fits Bosch Active Line (chainrings less than 20 teeth), Performance Line and Performance Line CX models
  2. For lockrings with 50mm outside diameter and 8 notches
  3. Torque wrench compatible 3/8" square drive
  4. Constructed of 4140 heat treated steel and plated for long life

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