BGM PRO Torquemaster - 2nd gear wheel (40 teeth) for Vespa PX Lusso
BGM PRO Torquemaster - longer 2nd gear for a sportier gear ratio
This gear wheel is not a standard gear ratio, but a targeted optimization of the 2nd gear.Instead of the standard
42 teeth, this version has
40 teeth.
The result: the
gear jump to 3rd gear is smaller, the gradation feels
more harmonious and sportier overall - especially with powerful setups.
Especially in the lower gears
1 and 2, where the driving resistance is even lower, the additional engine power can be better utilized.
The
2nd gear can be extended as far as a motorcycle without 3 and 4 becoming unnecessarily long - as often happens when only the
primary is selected longer. The long 2nd gear is therefore predestined for
powerful engines that like to be fully extended and are usually ridden
solo.
✔️ 40 teeth instead of 42 → 2nd gear approx. 5 percent longer
✔️ Smaller jump to 3rd gear → Significantly more harmonious overall ratio
✔️ More usable acceleration in 2nd gear in strong setups without 3rd gear . gear in strong setups, without stretching 3 and 4
✔️ Suitable for engines with over 30 hp and more than 35 Nm torque
✔️ Made from 14NiCrMo13 - high-alloy, case-hardened special steel
✔️ Heat treatment at ThyssenKrupp - industrial process reliability
✔️ Surface hardness of 58 to 60 HRC with tough core structure
✔️ Interchangeable with all PX Lusso gears from 1984
✔️ Suitable for PX125, PX150, PX200, Cosa 1/2, T5, LML Star and Stella 2-stroke
✔️ Can be combined with a sporty auxiliary shaft (e.g. auxiliary shaft BGM 12-13).e.g. auxiliary shaft BGM 12-13-16-19 with 4th gear 35 teeth)
Why "long 2nd gear" instead of just a longer primary?
An extended primary makes
all gears longer - this often makes
3rd and 4th gear too long in practice, especially with a heavy load or headwind. The longer 2nd gear solves a different problem: it
reduces the jump to 3rd gear and makes the transmission much smoother in sporty operation without unnecessarily stretching the long gears.
More pull and more coasting in 2nd gear with powerful engines
Harmonious connection to 3rd gear
3 and 4 remain practical instead of becoming "too long"
Material properties and heat treatment
The BGM PRO Torquemaster gears are made of 14NiCrMo13 (1.6657), a high-alloy case-hardening steel used in high-performance gearbox construction. Compared to the previous standard material (20NiCrMo2-2), there are decisive advantages:
✔️ High nickel content (~3.25 percent)
Increases toughness combined with high hardness - ideal for load changes, gas surges or clutch slipping.
✔️ Surface hardening to 58-60 HRC
Wear-resistant surface with a tough core - suitable for high contact and bending loads.
✔️ Dimensional accuracy after hardening
Low-stress annealing and precise machining ensure exact tooth flanks and smooth running.
✔️ Industrial heat treatment at ThyssenKrupp
Consistent hardness curves and reproducible microstructure properties.
✔️ Very high fatigue strength
Designed for high-performance engines and heavy-duty use in road and racing applications.
Compatibility
The Torquemaster 2nd gear wheel (40 teeth) is fully interchangeable with the original gear wheels of all Lusso-type Vespa gearboxes from 1984 onwards.
Compatible with:
✔️ Vespa PX125 / PX150 / PX200 Lusso (from 1984)
✔️ Vespa PX Disc, PX MY, PX 2011
✔️ Vespa Cosa 1 and Cosa 2 (all models)
✔️ Vespa T5 (all models)
✔️ LML Star 2-stroke, Stella 2-stroke
Note: The gearwheel is compatible with all commercially available auxiliary shafts that are approved for use with Piaggio or BGM components.
For the best possible gradation, we recommend combining it with a suitable auxiliary shaft (depending on the setup).
Frequently asked questions - BGM PRO Torquemaster 2nd gear (40 teeth)
Can I only replace the 2nd gear?
Yes. The gearwheel is available separately and can be specifically replaced.
What are the specific benefits of the 40-tooth version?
The 2nd gear is approx. 5 percent longer. This makes the jump to 3rd gear smaller and the overall gradation more harmonious - especially with powerful engines.
Why is this better than just a longer primary?
A longer primary quickly makes 3 and 4 too long. The long 2nd gear improves the connection to 3rd gear without unnecessarily stretching the upper gears.
For which power ranges is the gear wheel suitable?
For touring and road engines up to very powerful setups with well over 30 hp and 35 Nm.
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