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
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