E-bike owners and mechanics servicing the drivetrain on Bosch mid-drive motors.
The front sprocket on a Bosch mid-drive e-bike is held on by a lockring that ordinary chainring tools won't fit. The BBB LockOut BTL-128E is made for exactly that job, removing and refitting the lockring so you can swap a worn sprocket.
The handle is extra long for more leverage on a tight lockring, and the Kraton grip gives a firm, comfortable hold.
It's a smart tool for anyone who looks after their own e-bike drivetrain, as e-bike sprockets and chains wear faster than on a regular bike.
Bosch specific
Made for Bosch mid-motor sprocket lockrings.
Extra leverage
Long handle for tight lockrings.
Comfortable grip
Kraton covered handle.
Tool
Great for
Maybe not for
For Bosch mid-drive motors that use a lockring to hold the sprocket. The crank arm needs to come off first. Check your Bosch motor generation if you're unsure; we can confirm fit.
Crank off first
Remove the non-drive crank arm and the drive-side crank first to reach the lockring. Take a photo of the spacers before you pull anything apart.
Replace chain and sprocket together
E-bike drivetrains wear quickly. If the sprocket is hooked or the chain is stretched, replace both at the same time so the new parts mesh properly.
