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2. Three-speed bicycle - Wikipedia

   en.wikipedia.org/wiki/Three-speed_bicycle

   Three-speed bicycle. The three-speed bicycle is a bicycle that uses internal hub gears at the rear wheel hub to provide three gear ratios. Three-speed hubs have been in use since the early 1900s. Though they are heavier than comparable derailleur systems, internal-gear hub systems generally last longer and require less maintenance.

3. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   Automotive transmissions. A hub gear, [1] internal-gear hub, [2] internally geared hub[3] or just gear hub[4] is a gear ratio changing system commonly used on bicycles that is implemented with planetary or epicyclic gears. The gears and lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and ...

4. Sturmey-Archer - Wikipedia

   en.wikipedia.org/wiki/Sturmey-Archer

   All Sturmey-Archer gear hubs use epicyclic (planetary) geartrains of varying complexity. The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, and hubs with four or more speeds, use multiple ...

5. Comparison of hub gears - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_hub_gears

   This page is a list of internal hub gears for bicycles. Brand Model Introduced ... 3 165.1% 80 Nm ... e-bike Shimano Nexus 4 Speed 4 184% 1st gear

6. Shimano Nexus - Wikipedia

   en.wikipedia.org/wiki/Shimano_Nexus

   Shimano Nexus gear shift lever. Shimano Nexus is a brand of bicycle components which includes products such as epicyclical gear hubs, cranksets, shifters, brake levers, hub brakes, hub dynamos, and a CPU for automatically changing gears. The series is primarily aimed at the "comfort" market such as urban commuters and tourers, and as such is ...

7. Chappelli Cycles - Wikipedia

   en.wikipedia.org/wiki/Chappelli_Cycles

   The company takes its name from Robert Chappelli, [1] Pablo's father, who used to design and build his own bicycles to race in the Tour de France trials in England. In 2011, Chappelli Cycles released its first 3-speed internal hub bicycle and an 8-speed model.