BOSCH E-Bike Lockring Tool without Crank Puller

English below!

On my Cube Stereo Hybrid, the so-called lockring, the component securing the sprockets to the crankshaft, loosened after some time. A suitable BOSCH tool exists, but also requires a crank puller for prior crank removal.

My "lockring tool" functions without crank disassembly. It attaches to the crank from above (see photos). The crank acts as a lever; simply turn counterclockwise (note: lockring has a left-hand thread). Secure the chain guard, ideally with a screwdriver (see photos), to prevent it from rotating.

Heed the manufacturer's torque specifications.

I 3D-printed the tool using PLA-CF for robust stability; PET-CF or similar materials should also suffice.

English:

On my Cube Stereo Hybrid, the so-called “lockring”, the component that fixes the sprockets to the crankshaft, has come loose after some time. After a brief search, there is a suitable tool from BOSCH, but a so-called “crank puller” is also required to remove the crank beforehand.

My “lockring tool” can be used without removing the crank. It is simply attached to the crank from above (see photos). The crank acts as a lever, which is simply turned counterclockwise. (Attention: the lockring has a left-hand thread). The chain guard must be locked, preferably with a screwdriver or similar (see photos), so that it does not rotate.

Pay attention to the manufacturer's torque specifications.

I printed the mold from PLA-CF to achieve good stability, but PET-CF or other alternatives should also work.