CORONAVIRUS: DON’T WORRY, DELIVERIES ARE SUCCESSFUL! Orders continue to be prepared in our warehouse and carriers can deliver your packages to your home or workplace. All logistics are adapted and comply with health regulations.
Delivery possible on Tuesday 1 December
Delivery possible from Thursday 3 December
Indicative time in metropolitan France and excluding public holidays.
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: Fifty Motorcycle Parts / adaptable
Drive train type: 428
Number of teeth: 15
Number of mounting holes: 2 and 2
Diameter of fixing holes: 4mm and 5mm
Fixing distance: 24mm and 28mm
Sprocket width: 7mm
Splines outside of the tree teeth in front of the fixing holes, see photos
Sprocket dimensions detailed shown on the diagram
It is essential that you you check the type of drive train you need before ordering. On small motorcycles, most 50cc use the 420 (6mm width, 12.7mm pitch) but some 50s and most 125s use the 428 (7mm width, 12.7mm pitch) even for 125 in 520 (6mm width, 15.8mm pitch). All drive train parts, i.e. front sprocket, chain and rear sprocket, absolutely must be of the same type.
To mount a chain with a split link you just need multigrip pliers and perhaps a flat screwdriver. If you need to shorten it you will need a chain splitter. To avoid that count the number of links needed to order the right length.
Compatibility models for guidance, it is advisable to disassemble the part to be replaced beforehand and check the correspondence with pictures and dimensions indicated on the site.