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Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.
A multi-speed bicycle, by providing two or three different-sized driving sprockets and up to 12 (as of 2018) different-sized driven sprockets, allows up to 36 different gear ratios. The resulting lower gear ratios make the bike easier to pedal up hills while the higher gear ratios make the bike more powerful to pedal on flats and downhills.
Fixed sprockets and freewheels are also available in 3 ⁄ 32 in (2.4 mm) widths, so fixed-gear and single-speed bikes can be set up to use the narrower and lighter 3 ⁄ 32 in (2.4 mm) chains.) 1 ⁄ 8 in (3.2 mm) chains are typically used on bikes with a single rear sprocket: those with coaster brakes , hub gears , fixed gears such as track ...
When "safeties" replaced "ordinaries", chains and sprockets allowed small wheels to be turned faster than the pedal cranks. As result, a 28-inch wheel could be made to move a bicycle at the same speed as a 60-inch wheel. Such a bicycle was then said to be geared at 60 gear inches and pedalled similar to an ordinary with a 60-inch wheel.
By convention, the largest chainring is outboard and the smallest is inboard. Chainrings vary in size from as few as 20 teeth to as many as 60 and potentially more. Chainrings also come in several nominal widths: 3/16″ (4.76 mm) for old-time bikes (especially skip-tooth or inch-pitch), heavy duty BMX, Worksman, and exercise bikes
A 2019 survey found that globally, we think old age begins at 66. When asked to describe it, we usually use the term wise (35%), followed by frail (32%), lonely (30%), and respected (25%). People ...