BGM PRO Item number: BGM06419
BGM PRO
1 Rating
28,90 €*
available immediately
Shipping weight 0,07 kg

The BGM primary pinion shown here can only be used in combination with the matching BGM primary wheel. It can be used as a spare part or to adjust the gear ratio for the BGM PRO primary.

  • The primary sprockets 19-20-21-22Z are suitable for the primary wheel 64Z

  • The primary pinions 25-26 for the primary wheel with 65Z

By changing the primary pinion, which is only possible by disassembling the clutch cover, the primary gear ratio can be easily adapted to the needs.

Case study: An 85cc cylinder on a V50 is driven with a BGM primary 19/64 = 3.37. The cylinder is exchanged for a larger displacement 102cc cylinder. Afterwards, it is found that the larger displacement has greatly improved the pull, but the engine feels like it is over-revving, effectively missing fifth gear. Simply changing the primary pinion to, say, 21 teeth, extends the primary gear ratio to 2.90. The engine can now convert its increased torque much better, the gears can be extended further. At the same speed, the speed is higher, the final speed increases.



AI-translation

This is how we ensure, that reviews come from real consumers.
Oliver K. from Bergheim 08/13/2025
Gearbox shift scooter
Number of teeth small primary gear
19
Type of gearing
gerade
Combinable primary wheels
64 Zähne geradeverzahnt (BGM)
 
OEM numbers (for comparison purposes only)
Scooter Center:
BGM06419
Matching
Customers also bought