An internal gear hub provides multiple gears on a bicycle in an enclosed unit housed within the rear hub. Almost all bikes with gears now feature a derailleur system. But for a long time, internal ...
SunRace Sturmey-Archer has released the new A2 two-speed rear hub, featuring automatic shifting and four braking options. The A2 doesn’t require a shifter on the bar, meaning it should make for a ...
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