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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.
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 ...
428% [7] 160 Nm [7] 1200g raw cartridge, 1750g total system weight including SWAP and Hyseq Onesie [7] eMTB, heavy cargo, commuter. Rohloff AG. Speedhub 500/14.
Power transmission. Bicycle drivetrain systems have been developed to transmit power from riders to drive wheels by a variety of methods. Most bicycle drivetrain systems incorporate a freewheel to allow coasting, but direct-drive and fixed-gear systems do not. The latter are sometimes also described as bicycle brake systems. A belt-drive crankset.
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 mechanism are exposed ...
Cannondale has brought a few concepts to market that have since become accepted industry standards. Cannondale was the first to produce a crankset that uses externally mounted bottom bracket bearings, though they later discontinued this design. External bearings are now the most common type of bottom bracket for mid-level and higher bicycles.
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