How hard is it to replace an old Shimano rear derailleur with a new one, if the frame and wheel size is the same as before? - Quora
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Shimano 105 5700 Rear Derailleur Installation Manual | PDF | Human Powered Vehicles | Manufactured Goods
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Looking at the Shimano manual for my RD-7800 I see that they recommend (see picture 2) more tension in the chain than I currently (original length from the factory) have on my
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