BGM PRO Torquemaster - built for powerful torque and massive power.
These gears aren't just replacements: they're the answer to the need for performance beyond the standard limits. Made from the same material used by KTM, BMW, and others for high-performance transmissions. Hardened at ThyssenKrupp, precisely machined, and tested for maximum load in the laboratory - significantly more durable than original Piaggio components. Do you have an engine with over 30 hp and 35 Nm? Then you need gears that can withstand it - permanently. Torquemaster gears are designed for just that.
Suitable for engines with over 30 hp and more than 35 Nm of torque
Made of high-alloy 14NiCrMo13 special steel, a special high-alloy and case-hardened steel
Heat treated at ThyssenKrupp - industrial process reliability
Surface hardness of 58 to 60 HRC with a durable center structure
Interchangeable with all PX Lusso gears from 1984 onwards
Suitable for PX125, PX150, PX200, Cosa, T5, LML Star, and Stella 2-stroke models
For touring, everyday use, and high-performance tuning, right up to racing
Can be combined with a sports balance shaft (e.g., BGM 12-13 balance shaft).

e.g. BGM 12-13-16-19 auxiliary shaft with 35-tooth 4-speed gear
Material Properties and Heat Treatment
BGM PRO Torquemaster gears are made of 14NiCrMo13 (1.6657), a high-alloy case-hardened steel used in high-performance transmissions (e.g., in motorsports). Compared to the previous standard material (20NiCrMo2-2), it offers key advantages:

High nickel content (~3.25%)
Increases toughness combined with high hardness - ideal for load changes, gas shocks, or clutch slippage.

Surface hardening to 58-60 HRC
Perfect combination of wear-resistant surface and tough core for maximum contact and bending loads.

Dimensional accuracy after hardening
Low-stress annealing and precise machining ensure tooth flank accuracy, low running-in loss, and smooth operation.

Industrial heat treatment at ThyssenKrupp
Ensures consistent hardness curves and reproducible microstructural properties.

Significantly more resilient than Piaggio gears
Proven by independent pulsation tests.
Compatibility
Torquemaster gears are fully interchangeable with the original gears of all Vespa Lusso transmissions from 1984 onwards. Compatible with:

Vespa PX125 / PX150 / PX200 Lusso (1984-2016)
Vespa PX Disc, PX MY, PX 2011
Vespa Cosa 1 and 2 (all models)
Vespa T5 (all models)
LML Stella 2-stroke, Stella 2-stroke
The gears are compatible with all commercially available auxiliary shafts approved for use with Piaggio or BGM components.

Frequently Asked Questions - BGM PRO Torquemaster Gears
Can I replace just one gear?
Yes, the gears are available individually and are specifically interchangeable.

For which power ranges are the gears suitable?
For all setups, from touring engines to fully tuned high-performance units with over 30 hp and 35 Nm of torque.

What are the advantages of the new 14NiCrMo13 material?
Higher toughness, better dimensional stability after quenching, significantly higher fatigue resistance, even under racing conditions.