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
Oxford-Hachette French Dictionary: French–English English–French Oxford-Hachette French Dictionary: French–English English–French The Oxford-Hachette French to English/English to French Dictionary is one of the most comprehensive and recent bilingual French–English/English–French dictionaries. It was the first such dictionary to be written using a computerized corpus and it contains 555,000 translations as well as 360,000 words and expressions. The work was first published in 1994, with its second, third and fourth editions appearing in 1997, 2001 and 2007 respectively. Though the dictionary is entirely bilingual, it is marketed under two different names, one for French, one for English: Its version is also available in a concise or condensed version.