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The only scheme I know of is called planetary gears, or as Wikipedia calls it Epicyclic gearing. @Daniel suggests that there are other designs. Here is one of the images from Wikipedia: The inner gear is called the sun and the gears that go around that are called the planetary gears. In the basic design (the original Sturmey Archer design) the sun was ...


2

The original Sturmey-Archer 2 speed kick-back hubs are coaster brake hubs and do not allow much movement backwards before the braking happens. Track standing on a coaster break would be tricky because the pedal position would always rotate in the direction of travel and you would eventually end up at the dreaded 12 o'clock position. The new versions have ...



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