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- 3-speed planetary gearbox in a crankset installed on a BB axle
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3-speed front bicycle gearbox installed on a bottom bracket axle. As easy to install as a standard crankset. Easy to shift when pedalling and at standstill. Maintenance free. For all non-competition bikes (urban, city, trekking, touring, single-speed, folding, e-bikes, trike, recumbent).