Gear 3 -BGM PRO, 4-speed gearbox- Vespa PK S, PK XL1, PK XL2, ETS, V50 (V5A1T since no. 69444), Special (V5B3T since no. 94315), Elestart (V5B4T since no. 1514), PV125 (VMA2T since no. 150203), ET3 (VMB1T since no. 8161) - 50 teeth (std) | Gear boxes | Gear box | Engines

Preview: Gear 3 -BGM PRO, 4-speed gearbox- Vespa PK S, PK XL1, PK XL2, ETS, V50 (V5A1T since no. 69444), Special (V5B3T since no. 94315), Elestart (V5B4T since no. 1514), PV125 (VMA2T since no. 150203), ET3 (VMB1T since no. 8161) - 50 teeth (std)

Description

BGM Pro transmission gears 'made in Europe' for Vespa Smallframe.

BGM Pro gear parts are ultrasolid material. For highest stresses, the gear wheels are manufactured in Europe from high-alloy NiCrMo case-hardened steel (14NiCrMo13).
The precisely machined high-quality base material is then hardened at thyssenkrupp and is thus ready for the highest engine outputs. To guarantee this, BGM gears are subjected to extensive testing.

PRÜFLABOR
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 consistent high quality. No compromises.

USE
Usable for all types of use, whether tourer or racer.
The gradations correspond exactly to the original Piaggio gears. In addition, a shorter reduction fourth gear is available. The gears can be combined with all commercially available auxiliary shafts that are also approved for use with stock transmission parts.

GEAR TYPE 42
The BGM PRO gears are the latest version introduced by Piaggio in 1976. Colloquially known as the so-called PK gearbox, it was already used in the ET3 models as well as the V50 Special. Original gears of the new type are recognizable by the cast-in numbers/letters combination. The PK type gears start with '42' and end with '/s'.
The BGM PRO gears are therefore also marked '42'.

FIT
The BGM Pro gears fit on all engines that have this gear type ex works or have already been converted to it. For the conversion of older engines/vehicles (before 1976) no new main shaft is needed. Only the gear wheels and the PK type shift claw (height=50mm),
Conversion 3-speed
Also 3-speed engines can be easily converted with the appropriate shift claw (height=50mm) and the BGM Pro gear wheels to four-speed transmission.
Austria Gearbox
The Austrian mopeds have a longer secondary gearbox.
Here it is possible to convert to the BGM Pro gearbox if the secondary shaft is also replaced. This gearbox 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 as well as a narrower main shaft. Conversion is not possible here.

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

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