Gearbox (gears + auxiliary shaft) -BENELLI type GPX- Vespa PX125, PX150, PX200, T5 125cc, Cosa -

Benelli GPX Transmission – ultra-close ratios for maximum acceleration

Transmission components from Stefano Benelli have rightfully earned an excellent reputation in the racing scene.
If you're looking for reliable race-grade technology for your gearbox, you've come to the right place.
Hardened to an average of 60 HRC, Benelli parts offer the perfect balance of hardness and elasticity to withstand the extreme stresses of a race engine over the long term.

Race transmission for maximum acceleration

The GPX version offered here is a special, ultra-close-ratio race gearbox designed for maximum thrust on the racetrack. For regular street use, it should be combined with the longest possible primary transmission (e.g. BGM 25/62) to ensure a sufficiently high top speed.

Comparison with stock transmission:
Compared to a PX200 stock gearbox, the BENELLI GPX in its shortest version (12-12-15-15) covers the same gear ratio range with four gears that the stock gearbox covers with only three. In other words: the fourth gear of the GPX is as short as the third gear of the stock transmission (assuming the same primary ratio).

Special bearing included:
The GPX secondary shafts use a special bearing (15x32x13 mm), which is included in the package.

Three secondary shaft variants with graduated ratios

Three secondary shaft options:
Benelli offers the GPX transmission in three different ratio variants. The difference lies in the targeted shortening of the upper gears – ideal for racing and high-revving engine setups.

(US)