Nabenschaltungstheorie: Unterschied zwischen den Versionen

Many internal-gear hubs use one or two rods which slide lengthwise inside the hollow axle, each engaging an axle key which protrudes from a slot in the axle and moves internal elements of the hub lengthwise along the axle. The rod is connected to a shifter cable by a pullchain or a bellcrank mechanism at the end of the axle. Sturmey-Archer calls the rod and chain assembly an indicator spindle.

Many newer hubs instead route the cable around a pulley inboard of the right dropout. Rotation of a sleeve that encircles the axle engages or retracts a pawl or ratchet, or operates a cam that shifts elements lengthwise along the axle. With a rotary shifting mechanism, the cable attachment is better protected, but the internal mechanism becomes more complicated.