Gear Assy 1
Ring gear (1) is driven by the sprocket. The pawl 2(1) couples the sun gear 2(1) to the axle. The stepped planet gears (1) are driven by the ring gear (1). In doing so, the stepped planet gear's second gear step rolls off the fixed sun 2(1). The result is 0.774 rotations of planet carrier (1-2) for each sprocket rotation.
Gear Assy 2
(not featured to provide a better overview) Gear assy two (2) is shifted 1:1 and transfers the rotation from gear assy (1) direct to the sun gear (3)
Gear Assy 3
Ring gear (3) and sun gear (3) are coupled together, thus the stepped planet gears (3) cannot rotate. Gear assy (3) is therewith shifted 1:1 and transfers the rotation from gear assy (2) directly to the planet carrier (3).
One sprocket rotation results in:- 0.774 (gear assy 1) x 1 (gear assy 2) x 1 (gear assy 3) = 0.774 hub rotations.