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
Longest word in French Longest word in French This article lists some of the longest words in the French language. The longest word listed below, "hippopotomonstrosesquippedaliophobie" (36 letters) is the fear (or phobia) of long words. The word is formed from the Latin word "sesquipedalia" (singular "sesquipedalis"), which the Ancient Roman poet Horace used in "Ars Poetica" to describe excessively long words; literally, it means "a foot-and-a-half long". The length of the word "hippopotomonstrosesquippedaliophobie" is embellished with the prefix "hippopotomonstro" ("monster hippopotamus"), which is a characterisation of the feared words. Like the other phobias in the list, "hippopotomonstrosesquippedaliophobie" can be pluralised by adding the