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A single-speed bicycle is a type of bicycle with a single gear ratio and a freewheel mechanism. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle. Adult single-speed bicycles typically have a gear ratio of between 55 and 75 gear inches, depending on the rider and the anticipated ...
The front derailleur, however, switches gears almost 30% faster than Dura-Ace’s mechanical counterpart. [1] 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.
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. In either case, the control is operated by moving a cable that connects the shifter to the gear mechanism.
Shimano 600 front derailleur (1980). A derailleur (French pronunciation:) is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another.
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)
Seat tube: the roughly vertical tube in a bicycle frame running from the seat to the bottom bracket; Seat bag: a small storage accessory hung from the back of a seat; Seatpost: a post that the seat is mounted to. It slides into the frame's seat tube and is used to adjust ride height depending how far into the seat tube it is inserted
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 4 184% 1st gear City Shimano Nexus Inter-3: 3 187% 2nd gear 1220 g City SRAM Spectro E12 (Elan)
Inter 8 - The Inter 8 has interval percentages between the gears of 22, 16, 14, 18, 22, 16, 14, and a total range of 307%, comparable to a road bike derailleur gear systems, but as the other Nexus products, it is designed and intended for urban commuter use. The hub comes in a variety of versions, weighing between 1550 and 2040 grams stripped.
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