Derailleur gears several standards in use, and in each the product of the derailleur's actuation ratio and the length of cable pulled must equal the pitch of the rear sprockets. The following standards exist. Some rear derailleurs, especially for mountain bikes, incorporate a clutch to keep the lower length of chain in sufficient tension to prevent the chain from striking the bottom of the chain stay, called "chain slap", and which can damage the chain stay. Clutches are also helpful in preventing the chain from derailing from the chain ring on systems without a front derailleur. The front derailleur only has to
Québécois (word) la langue française mentions only a territorial meaning for "Québécois". Newspaper editor Lysiane Gagnon has referred to an ethnic sense of the word "Québécois" in both English and French. French expressions employing "Québécois" often appear in both French and English. 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