Derailleur gears by 13 drive-train. Most road bicycles have two chainrings, and touring bicycles commonly have three. The rear derailleur serves double duty: moving the chain between rear sprockets and taking up chain slack caused by moving to a smaller sprocket at the rear or a smaller chainring by the front derailleur. In order to accomplish this second task, it is positioned in the path of the bottom, slack portion of chain. Sometimes the rear-derailleurs are re-purposed as chain tensioners for single-speed bicycles that cannot adjust chain tension by a different method. Although variations exist, as noted below, most rear derailleurs have
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