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Old 03-11-18, 07:37 PM
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alcjphil
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It is not a sure thing that the derailleurs on that bike are non functional. It is more likely that the problem rests with the cables and possibly the shifters. Don't buy any parts until you are sure what the problem is. It would be foolish to buy a new derailleur only to realize that the shifter is seized. It is easy to test whether a derailleur is working, either front or back. Disconnect the cable and move the derailleur by hand from its rest position to another cog or chainring. If it returns to its original position when you let it go, it works. Buying the cheapest thing you can find to replace an already cheap component that may work is a waste. Giving a crappy bike to poor people who cannot afford to maintain them is not a gift, you are not doing them a favour. You would be better offering them a monthly public transit pass
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