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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 ...
A chain drive and rear derailleur gear change, the most popular system in use today A shaft-drive with crankset and rear gear hub. Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels.
Gear inches is an imperial measure corresponding to the diameter in inches of the drive wheel of a penny-farthing bicycle with equivalent (direct-drive) gearing. A commonly used metric alternative is known as metres of development or rollout distance , which specifies how many metres a bicycle travels per revolution of the crank.
From a mechanical viewpoint, up to 99% of the mechanical energy delivered by the rider into the pedals is transmitted to the wheels (clean, lubricated new chain at 400 W), although the use of gearing mechanisms reduces this by 1–7% (clean, well-lubricated derailleurs and a straight chainline), 4–12% (chain with 3-speed hubs), or 10–20% (shaft drive with 3-speed hubs).
In the single-chain system, the chain runs from the top of a chainring attached to the cranks to the top of a sprocket attached to the rear wheel hub with a freewheel, as with most bicycle chain drives. The chain then, usually, wraps around the rear sprocket to an idler sprocket between the rear wheel and the cranks, then runs back to a second ...
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Basket: it is an optional attachment on a bike and is used for carrying things; Bearing: a device that facilitates rotation by reducing friction; Bell: an audible device for warning pedestrians and other cyclists; Belt-drive: alternative to chain-drive; Bicycle brake cable: see Cable; Bottle cage: a holder for a water bottle
Brown was a proponent of fixed-gear, single-speed bicycles for ordinary street use. [26] Brown, with Galen Evans and Osman Isvan, developed a method to determine and compare bicycle gear ratios. For any combination of front chainring, rear cog, wheel size and crank length, his method results in a number that Brown terms the "gain ratio". [27]
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