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
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