Top quality special nut, made in Germany, for all Vespa engines with a clutch on the crankshaft before the year of construction 1990 that have a so-called castle nut in the original.
Therefore, it is suitable for all vehicles built from 1950 onward, e.g. V1-V5, VNB, VNA, GS150, GS160, Sprint, Rally, GT, GTR, T5, Cosa1, PX, PE, etc...
This nut, manufactured in Germany for us, completely replaces the old locking nut and thus enables safe and precise work even with a torque wrench. In addition to its manufacturing precision, it is also suitable for a tightening torque of more than 70Nm thanks to the use of a hardness 10 steel (in our internal tests we were able to load the nut with a tightening torque of 170Nm). Conventional cap nuts often yield at 40Nm. With the BGM nut, slippage and failure of the crankshaft/clutch hub due to a loose clutch nut are a thing of the past.


Replaces the original clutch gear nut
Fits all Largeframes with the old 6/7 spring clutch type
Hardness: 10
Tightening torque possible: more than 70Nm (not more than 100Nm and do not tighten with impact wrench)
Thread: M12x1.50 (with collar)
Diameter at collar: 18.6mm
Height: 9mm
Width between plates: 15
Includes matching toothed washer

Conclusion: no more slippage when loosening/tightening the nut, and a clutch that is fixed foolproof.

TIP: Also suitable as a sprocket nut for Flytech/Vespatronic for Vespa GS160 / GS4 (VSB1T), SS180 (VSC1T), Rally180 (VSD1T), Rally200 (VSE1T, Femsatronic)