The Gearbox is made of three axles :
bottom bracket axle ;
axle 2 ;
The bottom bracket axle turns axle 2 by the first step gear (yellow).
The axle 2 is the gearbox’s “heart”, where is located the patented shifting mechanism. It sets turns the gear selected (2nd line of pinions).
Axle 3 holds the tertiary pinions and outside drive linked to the rear wheel by the CarbonDrive belt or chain.
THE LITTLE EXTRA
The gearbox include the freewheel. With 48 engagement points by rotation (7.50°), above the average of 32 engagement point by rotation (11.50°), it give you a more reactive transmission on pedaling.
The Fix Hub on the rear wheel, manufactured by AIVEE, is include on the kit. (135mm wide and 12mm diameter broche)
The 2 hang spokes flanges have the same diameter and are perfectly centered with the rim. The wheel is stronger, stiffer and have an homogeneous comportment.
The hub is a single speed hub without driver which presents two advantages:
It is no longer necessary to make small retro pedal for shifting down. A micro stop or a simple release of torque is enough.
Weight gain: unsprung masses is reduce for more maniability, stability and a better sensibility of rear suspension.