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2. Hub gear - Wikipedia

   en.wikipedia.org/wiki/Hub_gear

   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 ...

3. Comparison of hub gears - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_hub_gears

   e-bike Shimano Nexus 4 Speed 4 184% 1st gear City Shimano Nexus Inter-3: 3 187% 2nd gear 1220 g City SRAM Spectro E12 (Elan) 1995 1999 12 339% 3500-4000 g City SRAM i-Motion 9: 2005 2012 9 340% 2000g (w/o brake)-2400g (with coaster brake) City SRAM G8: 2012 2015 8 260% 2088-2180 g [16] [17] City SRAM G9 2014 2015 9 292% 2088 g [17] City, Sport

4. Rohloff Speedhub - Wikipedia

   en.wikipedia.org/wiki/Rohloff_Speedhub

   Internal schematic of a Rohloff Speedhub 500/14 Internal picture of a Rohloff Speedhub 500/14 Assembling of the hub. The Rohloff Speedhub is an epicyclic internal hub gear for bicycles, developed and patented by Rohloff AG. It has been manufactured and marketed by that company since 1998. [1]

5. Shimano Nexus - Wikipedia

   en.wikipedia.org/wiki/Shimano_Nexus

   Shimano Nexus Inter 8 hub excluding auxiliary components. 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.

6. NuVinci continuously variable transmission - Wikipedia

   en.wikipedia.org/wiki/NuVinci_Continuously...

   The only application currently commercialized is the internally geared bicycle hub. The NuVinci CVT replaces derailleurs and other internally geared hubs, and provides a gear ratio range of about 350%, similar to that on bicycles with 8- or 9-speed hub gears, or with double chain rings (most racing or fast road bicycles). [12]

7. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   For bicycles equipped with hub gears, the gear ratio also depends on the internal planetary gears within the hub. For a shaft-driven bicycle the gear ratio depends on the bevel gears used at each end of the shaft. For a bicycle to travel at the same speed, using a lower gear (larger mechanical advantage) requires the rider to pedal at a faster ...