Esjot sprocket, 11 teeth, Made in Germany, oval mount 15x10mm, chain type 415 (1/2x3.16), Zündapp part no. 247-05.164. Suitable for Zündapp Bergsteiger M 25 type 434-02, M 50 type 434-01, automatic moped type 442, ZR 10/20/30 type 447 from chassis no. 9123690/9132690, ZA 25/40, A 25 type 460, ZB 22 type 447, ZD 10/30 type 446. endurance test: 3400 km.