A derailleur (French pronunciation: [deʁajœʁ]) is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes...

cog sizes. They were standard on most older derailleur bicycles from before the 1990s. An older derailleur-equipped bicycle with horizontal dropouts can...

lubricants are sealed within the shell of the hub gear, in contrast with derailleur gears where the gears and mechanism are exposed to the elements. Changing...

the bicycle. On single-speed bicycles and multi-speed bicycles using derailleur gears, the gear ratio depends on the ratio of the number of teeth on the...

rate Derailleur: an assembly of levers, usually cable-actuated, that moves the chain between sprockets on a cassette or chainring assembly Derailleur cage:...

producing its version of pull-chain, rod-guided, touring derailleurs, similar to those of French derailleur companies such as Huret and Simplex. In 1964, Suntour...

consisted of a triple-, double- or single chainring crankset, front and rear derailleurs, handlebar-mounted "finger" shifters, cantilever brakes, and large-flange...

Checker and the Derailleurs is a 1988 novel by American novelist Lionel Shriver. The novel, Shriver's second, follows the life of rock drummer Checker...

An autobike or automatically geared bicycle is a bicycle with a derailleur or internally geared hub (transmission) that shifts gears without intervention...

Hippolyte Juy was a French industrialist who made derailleur gears. He is credited with making the first derailleur with a collapsible parallelogram. A hinged...

construction or frame type (upright, folding, etc.); by gearing (single speed, derailleur gears, etc.); by sport (mountain biking, BMX, triathlon, etc.); by means...

wirelessly to a battery pack and to a small electric motor that drives the derailleur, switching the chain from cog to cog. An electronic system can switch...

type of bicycle with a single gear ratio. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the...

while racing, such as the quick release mechanism for bicycle wheels, derailleurs, and the rod gear for gear changing. Campagnolo has been awarded more...

reverse direction. Derailleur systems were first developed in the late 19th century, but the modern cable-operated parallelogram derailleur was invented in...

consist of a front bottom bracket with one or more chainrings, and a rear derailleur. Depending on the configuration of the velomobile there may be any number...

The chain is also more flexible sideways, which is needed for modern derailleur gearing, because the chainline is not always straight in all gear selections...

type of master link comes closest to being re-usable. For bicycles with derailleur gears, a special kind of master link has been developed to fit the narrow...

the 1930s. After a crash-course in new frame-building techniques and derailleur technology, Schwinn introduced an updated Paramount with Reynolds 531...

bike rear derailleur, dubbed “ESP”, that featured a 1:1 cable actuation ratio that was more tolerant of cable contamination. The new derailleur was compatible...

backwards. As a general rule, fixed-gear bicycles are single-speed. A derailleur for gear selection would introduce chain slack, which would interfere...

manufactured by BSA Cycles Ltd in 1949 to accompany their BSA 4 Star derailleur gear. The BSA design had a splined freewheel unit (BSA part No.8-1913)...

cassette, and the intricacies of a 10-speed, 11-speed or 12-speed rear derailleur were originally not found to be suitable combined with front shifters...

efficient dérailleur system, by which the chain is moved between different cogs called chainrings and sprockets to select a ratio. A dérailleur system normally...

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...

2018, he was leading Javier Gómez for most of the race when his rear derailleur broke. He ran 20 km with his bike and completed the race regardless. In...

frame near the crank, and it may be used in addition to or instead of derailleur gears or a hub gear. Cited advantages include improved shifting performance...

innovate introducing the 4 Star derailleur gear in 1949 along with an associated 4-speed 'unit' or cassette hub. The derailleur design was altered from 1950...

multi-speed bicycles have cable guides to get the derailleur cables past the bottom bracket. Older derailleur bicycles used either brazed-on or clamp-on guides...

introduced their own versions of the derailleur. SunTour notably introduced the slant parallelogram rear derailleur design in 1964, which is tilted to keep...