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Vintage illustration diagrams of Sturmey Archer 3 speed hub. #252682889
Description
Vintage diagrams of a Sturmey Archer 3 speed hub with integral hand operated internal expanding brake, Type KB. Bike gears. One set engages the gear ring; each set engages a different sun gear. These hubs all have odd numbers of speeds: the unity ratio, and pairs of higher and lower speeds achieved by locking each of the different sun gears to the axle.
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