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
Stand on the Word 33 ⅓ RPM extended single included: Stand on the Word (6:40) French artist K.I.M. launched a compilation in 2004 with the song (Miyage, Tigersushi records), that touched underground european electro scene. James Murphy later played it in the ParisParis disco club in Paris in 2005. French electro duo Justice sampled it on its 2007 D.A.N.C.E hit. French director Maïwenn used it the Polisse movie in 2011. The biggest commercial success of the song has been by the French musical project "Keedz" that recorded it in 2008 and was the title track of their similarly titled album "Stand on the Word".,