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2. Bicycle gearing - Wikipedia

   en.wikipedia.org/wiki/Bicycle_gearing

   One standard option for the Brompton folding bicycle is to use a 3-speed hub gear (roughly a 30% difference between gear ratios) in combination with a 2-speed derailleur gear (roughly a 15% difference) to give 6 distinct gear ratios; this is an example of half-step gearing. Some Brompton suppliers offer a 2-speed chainring 'Mountain Drive' as ...

3. Bicycle drivetrain systems - Wikipedia

   en.wikipedia.org/wiki/Bicycle_drivetrain_systems

   1888 Geared Facile Bicycle in the Coventry Transport Museum A chain-drive and rear gear hub A bicycle gearbox with chain tensioner A penny-farthing with direct-drive. A cyclist's legs produce power optimally within a narrow pedalling speed range. Gearing is optimized to use this narrow range as best as possible.

4. Shimano Nexus - Wikipedia

   en.wikipedia.org/wiki/Shimano_Nexus

   Inter 5E - A 5-speed hub targeted at the e-bike market, launched in 2019. Unrelated to the previous Inter 5 model. Unrelated to the previous Inter 5 model. Available with a conventional twist-grip for mechanical shifting (SG-C70 00 -5 X series), or with an automatic shifter (SG-C70 50 -5 X series) [ 10 ] integrated with the Shimano STEPS e-bike ...

5. Comparison of hub gears - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_hub_gears

   5th gear 1550-2040 g City Shimano Nexus Inter-7: 1995 7 244% 1465-1860 g City Shimano Nexus Inter-5E 2019 5 263% 60 Nm 1st gear 1650 g 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)-

6. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Shaft-drive: alternate to chain-drive; Shifter: gear shifting control; Shock absorber: for bicycles with suspensions, a device that limits the rate at which suspension rebounds after absorbing an impact; Side view mirror: aids in looking at the sides prior to moving slowly or turning to the left or to the right

7. Electronic gear-shifting system - Wikipedia

   en.wikipedia.org/wiki/Electronic_gear-shifting...

   On traditional bikes, the front derailleur is problematic because the chain can be under tension and has to make a large vertical jump between chainrings. The electronic system's controlled motion overcomes these problems. The Di2 can also trim the front derailleur to eliminate chain rub and calibrate itself to adjust for wear and tear. [16]