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 among the clergy. French was therefore, at first, spoken in England under the form of this Anglo-Norman dialect. During the 12th century, continental French had a greater influence on Old English. It acquired great prestige in England, especially within the aristocracy and the clergy. It became the language of law and justice nationwide. Rich and noble families, most of them of Norman origin, taught their children French or sent them to study in France. The expansion of the French language in England was also encouraged by royal marriages. From Henry II Plantagenet and Eleanor of Aquitaine at the beginning of