Derailleur gears operates the lever while pedalling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets. For more information about the choice of particular gear ratios and sprocket sizes, see Bicycle gearing. "Derailleur" is a French word, spelled "dérailleur" in French, derived from the derailment of a train from its tracks. Its first recorded use was 1930. At least one notable bicycle industry author has attempted to promote the anglicized spelling of "derailer". As of 2013, however, neither Merriam-Webster nor the Oxford English Dictionary has an entry for "derailer". Various derailleur systems were
Influence of French on English chose to stay in England moved further away from France and, therefore, from the French language. Keeping its status as the language of justice and the language of power, England saw the first teaching manuals for teaching French to the English. These manuals were intended for English nobles who wish to perfect their knowledge of French and taught it to their children. Two types of French spoken in the higher spheres of English society could be distinguished during the thirteenth century : the Anglo-Norman dialect, which was the aristocrats' mother tongue, and a more prestigious type of French as a