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Derailleur. A derailleur (French pronunciation: [deʁajœʁ]) 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. [1]
Retro-direct. Design of the retro-direct gear, showing a system where the primary wheel sprocket is smaller and gives a higher gear than the secondary wheel sprocket; pedaling forwards uses the higher gear ratio. Bicycle with retro-direct. Retro-direct is a gearing mechanism used on some bicycles in the early 20th century, which provides a ...
A bicycle gearbox with chain tensioner. Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns. On some bicycles there is only one gear and, therefore, the gear ratio is fixed, but most modern bicycles have multiple ...
[16] [2] [26] The company placed a $400,000 order for an SY equipped with some features that 1647 and 1658 were built without, including a separate back-up air tank and safety chains between the locomotive and tender. [26] [27] [28]
All Sturmey-Archer gear hubs use epicyclic (planetary) geartrains of varying complexity. The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, and hubs with four or more speeds, use multiple ...
Transmission (mechanical device) A transmission (also called a gearbox) is a mechanical device which uses a gear set —two or more gears working together—to change the speed, direction of rotation, or torque multiplication/reduction in a machine. [1][2] Transmissions can have a single fixed-gear ratio, multiple distinct gear ratios, or ...
A sprocket, [1] sprocket-wheel[2] or chainwheel is a profiled wheel with teeth that mesh with a chain, rack or other perforated or indented material. [3][4] The name 'sprocket' applies generally to any wheel upon which radial projections engage a chain passing over it. It is distinguished from a gear in that sprockets are never meshed together ...
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