Rear Derailleur help- Mtbr.com
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  1. #1
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    Rear Derailleur help

    Sorry, I'am new to repairing my mtb.
    So i have a 1997? specialized ground control with shimano tourney rear derailleur. For some the derailleur always breaks when i go trail riding. My bike's rear top ring has 28 sprokets and it is 7 gears
    This is what happens to it

    <table style="width:auto;"><tr><td><a href="https://picasaweb.google.com/lh/photo/YpWAjV1xvp2cfVv_BPl7KjOvVxilCJNOstQx1DEePWw?feat=e mbedwebsite"><img src="https://lh3.googleusercontent.com/_MHC-4qL8UgI/Ta41U9DpIgI/AAAAAAAAAHQ/auGyrqSVfAI/s400/IMG_20110418_142432.jpg" height="299" width="400" /></a></td></tr><tr><td style="font-family:arial,sans-serif; font-size:11px; text-align:right">From <a href="https://picasaweb.google.com/101290832379361880358/Apr192011?authkey=Gv1sRgCOGogaybmOrgNg&feat=embedw ebsite">Apr 19, 2011</a></td></tr></table>

    i all ready bought 2 of them and both of them broke.
    Any adive

  2. #2
    Fat-tired Roadie
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    Looks like your chain's too long.

    There should be a screw that moves the derailleur cage further away from the cassette, if necessary, so the little wheels won't catch on the larger sprockets.

    parktool.com for really good tuning instructions with lots of pictures.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  3. #3
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    thanks man
    Do you think i could use an upgrade on my derailleur

  4. #4
    Fat-tired Roadie
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    A Deore would be a big improvement in shifting, but only if you stop breaking them.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  5. #5
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    those Tourney derailleurs are horrible, but having it adjusted will at least keep it from doing that. are you riding a full-suspension bike? definitely get a better unit next time.

    make sure your chain is short enough, your high and low limit screws are set correctly, and you cable tension is just right.

  6. #6
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    <table style="width:auto;"><tr><td><a href="https://picasaweb.google.com/lh/photo/NPkgizKTKYCb9boGva1v3kRhnxY2n0-eWP9aVbhrE2I?feat=embedwebsite"><img src="https://lh3.googleusercontent.com/_MHC-4qL8UgI/Ta48p-VJoyI/AAAAAAAAAHg/Gt2MSjX_tds/s400/download.jpg" height="299" width="400" /></a></td></tr><tr><td style="font-family:arial,sans-serif; font-size:11px; text-align:right">From <a href="https://picasaweb.google.com/101290832379361880358/Apr19201102?authkey=Gv1sRgCKLFw4S3m6aOeQ&feat=embe dwebsite">Apr 19, 2011</a></td></tr></table>

    thats my bike.
    My pullys also always break

  7. #7
    R.I.P. DogFriend
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    Are the hangers breaking too?

  8. #8
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    I think there's a lot going on with that RD that can't be figured out remotely. you need to take it to a local bike shop and have a good mechanic look at it. there are at least a dozen possible factors to consider here, but here are the obvious ones:

    is your derailleur hanger bent?
    is the chain too long, or too short?
    do you properly adjust the limit screws when you set it up?
    is the chain severely worn out/ stretched?
    is your axle bent or broken?

  9. #9
    Bicyclochondriac.
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    It "keeps breaking"? How do you keep using it if it is broken? Do you keep buying new ones?
    15mm is a second-best solution to a problem that was already solved.

  10. #10
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    whats a good 7 speed rd

  11. #11
    Fat-tired Roadie
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    Shimano Deore 9-speed. As long as you stick with Shimano and don't get a 10-speed, any number of speeds is fine. That part's just marketing text.

    But you need to stop breaking these things or it's going to cost you a lot more. They won't magically resist whatever you're doing to those Tourneys.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  12. #12
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    id buy Zinn and the Art of Mountain Bike Maintenance.....learn the principles behind the bike's components.

  13. #13
    Still New
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    Ouch. Sucks about the bike. Hopefully you can get it running ok

  14. #14
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    what kind of cage should i get

  15. #15
    Fat-tired Roadie
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    Long cage.

    Did you figure out why you keep breaking Tourney derailleurs?
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  16. #16
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    Is there a specific model of deore that i would get

  17. #17
    Haro Sonix LT VL120
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    Quote Originally Posted by alexpatsan
    Is there a specific model of deore that i would get
    Any deore 9sp will do. You can get these pretty cheap on ebay or jensonusa or the like. Sometimes they will have a model from one or two years back and you end up paying close to nothing for them.

  18. #18
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    do you think this one will work good
    http://cgi.ebay.com/SHIMANO-DEORE-LX...item5d2e899434
    Last edited by alexpatsan; 04-30-2011 at 06:21 PM.

  19. #19
    Haro Sonix LT VL120
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    Yup

    In that first pic, where is your cassette?

  20. #20
    R.I.P. DogFriend
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    One more time. Are the hangers breaking too?

  21. #21
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    no the hanger is not broken, and the cassette is there, it is just black and you cant see it

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