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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.
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]
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; Seatstay: frame components, small diameter tubes running from top of seat tube to rear dropouts; Shaft-drive: alternate to chain-drive; Shifter: gear shifting control
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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 ...
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)
The shift ratios are 1.5 for modern units but their old units had 1.4 ratios. [23] The Suntour's convention. [23] Shifters employing one convention are generally not compatible with derailleurs employing another, although exceptions exist, [24] and adaptors are available. [25] SLX Derailleur with the front plate removed, making the clutch ...
The radius of curvature of cables on a folded bicycle can be as low as 1.5 inches, (4 cm); therefore it is advisable to shift to the gear with the lowest cable pressure before folding, to minimize any adverse effects on housings or derailleurs. [citation needed] This gear is usually the one with the highest index number on the gear shifter.
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