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2. Cogset - Wikipedia

   en.wikipedia.org/wiki/Cogset

   An 8-speed cassette is wider at 41.5 mm than a second generation Shimano 7. This results in functionally compatible shifters, but specific freehub bodies, or necessitating the use of a spacer with a 7-speed cassette on an 8-speed hub. 8- and 9-speed cassettes and freehub bodies have the same width (41.5 mm), yet the sprockets on the 9-speed are ...

3. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   v. t. e. Sturmey-Archer S3X. 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 ...

4. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   The SRAM DualDrive system uses a standard 8 or 9-speed cogset mounted on a three-speed internally geared hub, offering a similar gear range to a bicycle with a cogset and triple chainrings. Less common is the use of a double or triple chainring in conjunction with an internally geared hub, extending the gear range without having to fit multiple ...

5. Freehub - Wikipedia

   en.wikipedia.org/wiki/Freehub

   A freehub is a type of bicycle hub that incorporates a ratcheting mechanism. A set of sprockets (called a "cassette") is mounted onto a splined shaft of the freehub to engage the chain. The ratcheting mechanism is a part of the hub, in contrast to a freewheel, an older technology, which contains both the sprockets and a ratcheting mechanism in ...

6. 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.

7. Comparison of hub gears - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_hub_gears

   Comparison of hub gears. 1 language. Norsk bokmål; ... e-bike Shimano Nexus 4 Speed 4 184% 1st gear City Shimano Nexus Inter-3: 3 187% 2nd gear 1220 g City SRAM