50factory 15 teeth 428 sprocket Derbi, Aprilia, Gilera... Fifty
15 sprocket teeth Derbi New gearbox gearbox adaptable for motorcycle 50cc Derbi, Gilera, Aprilia and other motorcycles with motor Derbi all years and Eurocka and other motorcycles with 139 FMB, FMB-B engines depending on assemblies (428 origin). Front sprocket technical characteristics and dimensions Mark:
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