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  1. #1
    Knomer
    Reputation: Dusty Bottoms's Avatar
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    Do front derailleurs wear out?

    The component in question is an XT that's adorned my 5spot for the last 3 years, since it's inception. Performance had deteriorated the last month or so, so I disconnected the cable to see what was up.

    As I moved the cage thru its range manually, the motion was indexed and never came to its natural resting place(in line with the small ring) without a little push from my finger.

    I have to imagine all the joints on these things are bushings, right? So drenching them with tri-flow as I did today will probably only exacerbate the problem.

    Is there anything that can be done about this, or is time for a new one? I hate having to replace parts that you can't really upgrade. I mean come on, who gets hot and bothered over an XTR front derailleur? Maybe I can have it dipped in gold or something.
    Global Director of Sales: Knolly Bikes

  2. #2
    No, that's not phonetic
    Reputation: tscheezy's Avatar
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    Do you have a mark on your chainstay yoke that would correspond with the bottom of the der cage where the two could meet at suspension bottom-out?

    I have had front ders "seize" and I suspect that getting smashed by the swing arm may have something to do with it. Only the front ders on my full suspension bikes have ever gotten stiff. Never on hard tails or road bikes. I suspect foul play.
    My video techniques can be found in this thread.

  3. #3
    Pixie Dust Addict
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    The front derailleur on my Flux is an XT that seizes up from time to time. I usually drench it in a solvent tank to clean out any crud that has built up. I'll then blow it out with a compressor and add a few drops of Tri-Flow to the pivots. After that, it seems to work OK for another year or so.

  4. #4
    Knomer
    Reputation: Dusty Bottoms's Avatar
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    Quote Originally Posted by tscheezy
    Do you have a mark on your chainstay yoke that would correspond with the bottom of the der cage where the two could meet at suspension bottom-out?

    I have had front ders "seize" and I suspect that getting smashed by the swing arm may have something to do with it. Only the front ders on my full suspension bikes have ever gotten stiff. Never on hard tails or road bikes. I suspect foul play.
    I have 3 rings and matching chainstays, so my front changer is sky high. No chance of contact.

    Nevermind the cause, is there a solution?
    Global Director of Sales: Knolly Bikes

  5. #5
    Natl. Champ DH Poser/Hack
    Reputation: cactuscorn's Avatar
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    stiff to the point of index is a new one on me. cheesey may be right about the contact. other than that, the pivots in the parrallelogram do wear out over time but 3 years seems a bit fast. if ya can shake it up n down or side to side on the bike by grabbin the tail of the cage, its killed. maybe if ya soaked it in milk......
    No, I'm NOT back!

  6. #6
    mtbr member
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    I still have almost every component I've ever bought (except chains, of course). What I don't have I gave away in a huge box to that soldier in Iraq who was requesting bike parts a few months ago. I still use the front and rear derailleurs and XTR shift/brake levers I got on a bike in 1998. I got modern stuff but I treat them all the same, which is: cleaning when really dirty, no high pressure cleaning AND lubing of every joint/pivot that moves. I've used Finish Line Dry for a long long time. I've never subscribed to the theory that these parts wear out...and they haven't for me. Caveat: I don't live near an ocean, like Dusty and tscheezy. Lube lube lube. That is all.
    A blind man searches in a dark room for a black hat that isn't there. Dashiell Hammett

  7. #7
    Natl. Champ DH Poser/Hack
    Reputation: cactuscorn's Avatar
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    yep. thats about all ya can do. straight simple green works well if ya give it 12 to 24 hours submerged. any wet lube is good. i use tri flow, t9 or rock n roll blue dependin on the season and conditions. tri flow for dry and clean, t9 for dry and dusty, r n r for wet n shytty.
    No, I'm NOT back!

  8. #8
    ~Disc~Golf~
    Reputation: highdelll's Avatar
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    is there any way to see what's causing the bind? I know that sounds elementary. But really study it while moving it through it's range--pivots, swing arms, springs etc..use a finger from your free hand to 'feel' areas when the binding occurs, something should be evident.
    Unless you bashed it somehow, I'd suspect it's most likely contaminated w/ grit. Although, the 'indexing' you spoke about is some what perplexing...If your mech was contaminated for a period of time, the bushings could have worn down leaving 'sweet-spots' (?). --but I can only imagine what could happen as I have never seen it happen as you describe.
    Honestly... ahh I give up

  9. #9
    Knomer
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    I'm soaking the changer in Palmolive overnight. We'll see if that doesn't loosen her up.
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  10. #10
    post-ride specialist
    Reputation: icegeek's Avatar
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    Quote Originally Posted by Dusty Bottoms
    I'm soaking the changer in Palmolive overnight. We'll see if that doesn't loosen her up.

    Oh Madge!
    Since when did Need have anything to do with this?

  11. #11
    ride
    Reputation: ignazjr's Avatar
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    I see that from time to time - like when you have to push it to go back to granny position. If it's not bent, I'll saturate the der in White Lightning and blow it out with an air compressor. Repeat until freed up. I like WL for applications like this because it's very light and non oil based so it won't attract dust and dirt.
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  12. #12
    Rolling
    Reputation: lidarman's Avatar
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    Good question.

    This is a 1997 XTR front D, Top swing. It is on a bike with 18,000 miles on it. This derailleur has been on it the whole time.

    It's sometimes hesitates going from middle to large ring but still works well.

    However, it's on a hardtail, not a Turner.


  13. #13
    Toby Wong?
    Reputation: Tappoix's Avatar
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    yo momma deteriorated but an overnight soak in palmolive did the trick

    happy new year, Sparky!
    lets not make it a religion, it is recreation

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