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 from the 1066 conquest that proto-English became massively impregnated with Old French, then modern French. It should be noted, however, that only French influenced English in the centuries following the conquest. The reverse contribution of English to French was only real from the eighteenth century. The arrival of William the Conqueror and his barons significantly changed the linguistic situation in England. Norman was essentially imposed in the upper layers of society. The Anglo-Saxon dialects were supplanted by Norman in the circles of the court and aristocracy, justice and the Church. The influential circles, who came from Normandy and settled in