BGM Pro gearbox 'made in Europe' for Vespa Smallframe
Completely assembled and cleanly spaced out gearbox - ready to install.
Gear steps as original.
Shorter, sportier gear steps possible by simply changing the auxiliary shaft (see accessories).
The precisely machined, high-quality base material is then hardened at thyssenkrupp and is therefore ready for maximum engine performance. To guarantee precisely this, BGM gears are subjected to extensive series of tests.
TEST LAB
Pulsation tests in a German test laboratory, in which we compared the very stable old original Piaggio gears with our BGM prototypes, showed a 50% higher load capacity of the BGM gears. The precisely defined surface hardening to 58-60HRC also makes the sprockets extremely resistant to wear. Better than Piaggio goods. Always consistently high quality. No compromises.
Application
Suitable for all types of use, whether Tourer or Racer.
The gear ratios correspond exactly to the original Piaggio sprockets. A shorter reduction fourth gear is also available. The gears can be combined with all commercially available auxiliary shafts that are also approved for use with standard transmission parts.
GETTYPE 42
The BGM PRO gears correspond to the latest version as introduced by Piaggio from 1976. Colloquially known as the so-called PK gearbox, it was already used in the ET3 models and the V50 Special. Original gear wheels of the new type can be recognized by the cast-in number/letter combination. The gear wheels of the PK type start with '42' and end with '/s'.
The BGM PRO gear wheels are therefore also marked '42'.
FIT
The BGM Pro gearwheels therefore fit all engines that have this gearbox type ex works or have already been converted to it. No new main shaft is required to convert older engines/vehicles (pre-1976). Only the gear wheels and the PK type shift claw (height=50mm),
3-speed conversion
3-speed engines can also be converted to four-speed transmissions without any problems using the appropriate shift claw (height=50mm) and the BGM Pro gear wheels.
Austrian gearbox
The Austrian mopeds have a longer secondary gearbox.
This can be converted to the BGM Pro gearbox if the secondary shaft is also replaced. This transmission was also used on vehicles for other markets (e.g. Portugal).
Exceptions
Vespa V50 1° series (V5A1T) with 1° series engine (V5A1M up to engine number 92876): These engines have a narrower engine housing and a narrower main shaft. Conversion is not possible here.
Conclusion: Very stable gearbox components with an excellent price-performance ratio
