BGM Pro Secondary Shaft 'Made in Europe' for Vespa Smallframe

BGM Pro transmission parts are made of ultra-solid material. For the highest stresses, the secondary shafts are manufactured in Europe from high-alloy NiCrMo case-hardened steel (14NiCrMo13).
The precisely machined, very tough and strong steel is then hardened at Thyssenkrupp, making it equipped for the highest engine performance. To guarantee precisely this, BGM transmission parts undergo extensive test series.

TEST LABOR
Pulsation tests in a German test laboratory, in which we compared the very stable old original Piaggio secondary shafts with our BGM Pro prototypes, resulted in a 50% higher load capacity of the BGM PRO secondary shaft. The precisely defined surface hardening to 58-60HRC also makes the pinions extremely resistant to wear. Better than Piaggio parts. Consistently high quality. No compromises.

APPLICATION
Usable for all types of stress, whether tourer or hardcore racer.
They harmonize perfectly with the BGM PRO gears for Vespa Smallframe.
The BGM PRO secondary shafts are available in three stages:

STANDARD STAGING (BGM01822)
The standard staging exactly corresponds to the original Piaggio transmission as installed as standard in almost all 50-125cc Smallframe engines. Can be used with the original gears (Z 58-54-50-46) or (alternatively to BGM01821) with a short 4th gear (Z 48).

SPORT STAGING (BGM01821)
For sportier setups that require a tighter gear ratio between 3rd and 4th gear, BGM01821 is ideal. Here, the fourth gear is one tooth shorter, ensuring that the engine is always perfectly in the power band when shifting from 3rd to 4th gear. Often used when a strong resonance exhaust is used with a tuning cylinder.
Very good alternative to a short 4th gear (Z48) because fewer teeth also always result in a more stable gear/secondary shaft (wider tooth base). Used with the original gears (Z 58-54-50-46).

RACE STAGING (BGM01720)
Here, the third gear is already one tooth shorter, the fourth gear already two teeth shorter. These short gear jumps enable you to always stay perfectly in the power band of a high-revving engine. For road use, it is usually combined with a longer primary gear ratio to achieve sufficient top speed. The 1st-2nd gears are then correspondingly long and can already be used as full gears.

FITS
The BGM PRO secondary shaft fits all Smallframe engines with a four-speed transmission.

EXCEPTIONS
An exception are the so-called small motorcycle transmissions (so-called 'Austria transmissions').
The Austrian small motorcycles have a longer secondary transmission.
Here, the BGM Pro secondary shaft can be retrofitted if the gear wheels are also replaced. This transmission was also used in vehicles for other markets (e.g. Portugal).
Also excluded are the V50 1°Serie vehicles (V5A1T) with 1° Serie engine (V5A1M up to engine number 92876): These engines have a narrower engine housing and a narrower main shaft. Retrofitting is not possible here.

CONCLUSION: Very stable transmission components with an excellent price-performance ratio

About the manufacturer BGM

BGM is a leading brand for high-quality spare parts and accessories for scooters, motorcycles and classic Vespa models, which stands for quality, precision and innovation. With a uncompromising “Made in Germany” philosophy, BGM develops durable products in collaboration with leading engineers and under strict quality controls. Whether restoring vintage vehicles or tuning modern scooters – BGM is the first choice for demanding drivers. Thanks to first-class workmanship and a wide range, BGM offers ideal solutions for performance, everyday use and individuality.