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  1. #1
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    Help choosing a replacement rear derailleur

    My daughther's bike is a 21 speed mountain bike I purchased from wal-mart a few years ago. The rear derailleur was mangled by a neighbor taking out his frustrations. Anyway, I now need to replace it and no longer have the one that was removed. Here's what information I have

    Shifters are on the handle bars and are the ones that click (indexing?) and the word Falcon appears on them.

    Rear sprokets have following number or teeth
    14-16-19-20-22-24-28

    I called the local bike shop and they quoted $50 minimum for any derailleur they carry + labor and I only paid $80 for the bike. If it's going to run me that much, I'd just as soon replace the bike. Any advice on a supplier is helpful also.

    Thanks,
    edchest

  2. #2
    Junior Member taz77's Avatar
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    I replaced my rear derailleur on a bike from toys r us, bought about 9 years ago. Apparently, the rear derailleur isn't the same as what they have now, in that the bike frame does not have a derailleur hanger built in. I had to get a derailleur with the hanger built into the derailleur.

    http://www.jensonusa.com/store/imgWr...__2.jpg&type=2
    http://www.jensonusa.com/store/imgWr...BKS.jpg&type=2

    If you notice the top left of each pic, you'll see the difference. My older Toys R Us 21 speed mountain bike needed the derailleur with the built in hanger like in the second pic. $13 +s/h. Cheap, but works fine for what I needed it for.
    Toyota Certified Expert Technician
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  3. #3
    Luggite bsyptak's Avatar
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    I believe from what I've read that those are Shimano Tourney knock-offs, and so are Shimano compatible. If so, look for a Shimano Tourney or Alivio derailleur, long cage. An 8 speed der will work fine on your 7 speed bike.

    Like this: http://cgi.ebay.com/ws/eBayISAPI.dll...m=110146139519

    Also, make sure that the derailleur hanger (holder) didn't also get snapped off the bike when the derailleur did. If so, you may be completely out of luck, because I doubt you will be able to find one for a $80 bike try derailleurhanger.com). This page shows you an image of a typical hanger and how to straighten it. Keep in mind if it's aluminum and bent, it might snap when you try to straighten it.

    http://www.parktool.com/repair/readhowto.asp?id=39

    Best o luck.

  4. #4
    Senior Member Bill Kapaun's Avatar
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    Another option is to check the local Goodwill etc. for a donor bike. Remove what you need and "donate" the bike back.
    As far as compatibility, I don't consider Falcon to be compatible with itself.

  5. #5
    Elitist Troglodyte DMF's Avatar
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    I believe from what I've read that those are Shimano Tourney knock-offs, and so are Shimano compatible. If so, look for a Shimano Tourney or Alivio derailleur, long cage.
    I have a used Tourney with built-in hanger if you determine that's what you need.
    Stupidity got us into this mess - why can't it get us out?

    - Will Rogers

  6. #6
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    Thanks to all for your help. I ordered an inexpensive Tourney and installed it, only to find that the front sprokets (on the crank) are warped/out of plane and the chain slips off one and onto the next as it spins. I just can't win here. I'll need to fingure out whether that repair is worth the $ and effort.

    Thanks again

  7. #7
    SE Wis dedhed's Avatar
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    can you get an adjustable wrench on the front chain rings and straighten them?

  8. #8
    Senior Member AlucardZero's Avatar
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    I got a SRAM 3.0 ($20 on Amazon) and it works well... That was for my walmart bike that is now destroyed.

    Also, it's not worth a repair, honestly. Cheaper to spend money on a new bike. You're going to find another problem when you fix the chainrings.
    Trek 4500

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