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 English is also known as Webster Lake. The longest hyphenated names in the U.S. are "Winchester-on-the-Severn", a town in Maryland, and "Washington-on-the-Brazos", a notable place in Texas history. The longest official geographical name in Australia is Mamungkukumpurangkuntjunya. It has 26 letters and is a Pitjantjatjara word meaning "where the Devil urinates". In Ireland, the longest English placename at 19 letters is Newtownmountkennedy in County Wicklow. "Guinness World Records" formerly contained a category for longest personal name used. Long birth names are often coined in protest of naming laws or for other personal reasons. Longest word in English The identity of the