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
Word on a Wing things' Bowie seems to be suspicious of having blind faith with regards to religion, exclaiming 'just because I believe don't mean I don't think as well, don't have to question everything in heaven or hell'. This suspicion seems to contradict the sentiment Bowie had while recording Golden Years, where is exclaimed 'I believe all the way'. Bowie later admitted that "there was a point when I very nearly got suckered into that narrow sort of looking... finding the cross as the salvation of mankind around the Roeg period". Word on a Wing "Word on a Wing" is a song written