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
1987 (What the Fuck Is Going On?) of our original record. To do this you will need 3 wired-up record decks, a pile of selected discs, one t.v. set and a video machine loaded with a cassette of edited highlights of last weeks 'Top of the Pops'. Deck one is to play this record on, the other two are to scratch in the missing parts using the selected records. For added authentic effect you could use a Roland 808 drum machine (well cheap and what we used in the original recordings) to play along behind your scratching. By 2000, a copy of the original version of "1987"