Galvanized sprocket (chainwheel), not offset, 40 teeth for rear pedal cycles of various brands and models (Puch X30 NS/NL, X30 Velux, Sachs, Zündapp Belmondo, etc.).

Dimensions:
Inner diameter: 94 mm
Pitch circle diameter: 105 mm
Mounting hole diameter: 6.4 mm

With different sprocket sizes, the gearing can be varied. Larger sprockets increase the rpm and improve the acceleration, while smaller sprockets reduce the rpm at the rear wheel and increase the top speed. At the same time, there is always a loss of top speed with larger and a loss of acceleration with smaller sprockets as a consequence.