This gearbox is mounted on all DERBI Euro 1, Euro 2, Euro 3 and 4 engines as well as on DERBI GPR engines. Made in the best steels, with high breaking load and elastic limit, all the pinions have been resized, and BIDALOT has developed the toothing corrections in order to improve the resistance of the teeth.
The gear changes are also obviously easier and improved. This gearbox allows the power of the Pack Racing Factory to be passed without hindrance. You will note that this gearbox is delivered complete, ready to install, the primary and secondary shafts being delivered assembled with all the washers, circlips and other needle cages.
All these elements are original DERBI references. Finally, this gearbox is really of very high quality and can not be considered as an ordinary adaptable ... It is improved at all levels, very high quality, solid ... It allows much better use of the power engine on large configurations!
You will find below, grouped in the form of a table, the new stages of each report, in comparison to the original box.
As you can see, appear :
- Z1 = Number of teeth of each primary gear
- Z2 = Number of teeth of each secondary wheel
- Z1 / Z2 = Gear ratio of each gear
- The percentage of the maximum speed on each report, compared to the maximum speed in 6th
- The percentage difference between each report
- The speed at which the engine falls, for changing from a gear higher than 14000rpm
