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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 ...
They can be used individually, as an external derailleur or an internal hub gear, or in combinations such as the SRAM Dual Drive, which uses a standard 8 or 9-speed cassette mounted on a three-speed internally geared hub, offering a similar gear range as a bicycle with a cassette and triple chainrings. Derailleur gears. Cogset; Crankset; Hub gear
In 2001 Shimano introduced a set of trekking components called Di2 (Digital Integrated Intelligence), which included electronic shifting and automatic adaption of front and rear derailleur to riding speed. During the 2000s both Shimano and Campagnolo (2005) [6] experimented with electronic shifting in professional cycle races. [3]
Shimano: Alfine SG-700 2010 2017 [9] 11 409% n/a 1600-1744 g [12] [13] [14] City, Sport Shimano Alfine SG-500 2006 2016 (?) [15] 8 307% 1600 g City Shimano Nexus Inter-8: 8 307% 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 ...
A twist-style 14-speed indexed shifter made by Rohloff A bicycle shifter or gear control or gear levers is a component used to control the gearing mechanisms and select the desired gear ratio . Typically, they operate either a derailleur mechanism or an internal hub gear mechanism.
Shimano STI Dual Control shifter and brake lever: 1. Main lever 2. Release lever A. Pulling the main lever towards the rider applies the brake B. Pushing the main lever towards the center of the bike downshifts one, two or three gears depending on how far the lever is pushed (right hand shifter) or changes from a small chainring to a larger chainring (left hand shifter)
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 ...
The interactive glide gear system is an extension of hyperglide, in which both sides of the bicycle gear sprockets are physically contoured to improve upshifting. Interactive glide sprockets are slightly thicker than hyperglide variants, and due to this difference, some Shimano Hyperglide chains may hang up if used on an interactive glide cassette.