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
Québécois (word) Québécois (word) Québécois (pronounced ; feminine: Québécoise (pronounced ), ' (fem.: '), or (fem.: ) is a word used primarily to refer to a native or inhabitant of the Canadian province of Quebec, the majority of whom speak French as a mother tongue. It can refer to French spoken in Quebec. It may also be used, with an upper- or lower-case initial, as an adjective relating to Quebec, or to the French culture of Quebec. A resident or native of Quebec is usually referred to in English as a Quebecer or Quebecker. In French, Québécois or Québécoise usually refers to