This crank wedge is an essential replacement part for the secure and power-transmitting connection of the crank arm (pedal arm) with the crankshaft (or bottom bracket) on many common mopeds and older bicycles.

Key features:
- Diameter: 9.0 mm.
- Function: Serves as a wedge that is driven into a corresponding recess (wedge slot) on the crank and shaft to ensure a form-fitting and solid connection.
- Material: Usually made from high-strength steel to withstand the high shear and bending forces during pedaling.
- Application: Indispensable for the assembly and repair of the bottom bracket, especially in older models that do not yet use a square or multi-tooth system.