Advertise on Bikeforums.net



User Tag List

Results 1 to 9 of 9
  1. #1
    Neat - w/ ice on the side dalmore's Avatar
    Join Date
    Oct 2005
    Location
    Big Ring. Little Cog.
    My Bikes
    2005 Dahon Speed TR, 2006 Dahon Mu SL, 2000 GT XiZang, 1999ish Rock Lobster, 2007 Dean Animas CTI
    Posts
    1,200
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Can't keep the Rear Derailer aligned. help!!

    It's a XTR on a hardtail mountain bike circa 2000ish. I got it used about a month ago. Sweet ride except for this little PITA issue.

    I can get it aligned and shifting great but then after about a 25-30 miles it goes out of alignment again. Suddenly. And by a lot like I lose travel to 2 or 3 rings. Sometimes it's the big rings some times it's the little rings. I'm thinking something must be faulty and needs to be replaced.

    Maybe a kinky cable? I can't find any travel problems and the cable looks good on visual inspection. Replacing it is my next plan of attack unless someone here has a better idea.

    Maybe a shifter problem? Everything seems ok there. The barrell adjuster isn't loose or broken and the cable is seated properly. Any thoughts?

    I can't think of any thing in the derailer itself that could do this.

    Someone point me in the right direction ... please!
    Current favorite bumper sticker: Wag more. Bark less.

    Change you can believe in - Bigfoot Nessie 08

  2. #2
    Senior Member
    Join Date
    Jan 2006
    Posts
    910
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    How old are the shifters? Maybe the rachet mechanism in the shifter might be worn?

  3. #3
    Neat - w/ ice on the side dalmore's Avatar
    Join Date
    Oct 2005
    Location
    Big Ring. Little Cog.
    My Bikes
    2005 Dahon Speed TR, 2006 Dahon Mu SL, 2000 GT XiZang, 1999ish Rock Lobster, 2007 Dean Animas CTI
    Posts
    1,200
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I guess that's possible. any test you can think of for that?

    Only test I can think of is to eliminate the cable as the possible problem and assume it must be the shifter then.

    Well, I guess it could be the mechanic...
    Current favorite bumper sticker: Wag more. Bark less.

    Change you can believe in - Bigfoot Nessie 08

  4. #4
    BF Risk Manager
    Join Date
    Mar 2006
    Location
    Snohomish County, Washington USA
    My Bikes
    Road, mountain and folding
    Posts
    894
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Check to see if the rear derailleur hanger is bent.
    Regards, MillCreek
    Snohomish County, Washington USA

  5. #5
    118AHC "Thunderbirds" 2372ighost's Avatar
    Join Date
    Oct 2005
    Location
    AL.
    My Bikes
    Numerous (wife says to many)
    Posts
    235
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Clean the shifters with a sray degreaser, then relube. This solved a similar problem with thumb shifters for me.

  6. #6
    Neat - w/ ice on the side dalmore's Avatar
    Join Date
    Oct 2005
    Location
    Big Ring. Little Cog.
    My Bikes
    2005 Dahon Speed TR, 2006 Dahon Mu SL, 2000 GT XiZang, 1999ish Rock Lobster, 2007 Dean Animas CTI
    Posts
    1,200
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    nope hanger is fine.
    Current favorite bumper sticker: Wag more. Bark less.

    Change you can believe in - Bigfoot Nessie 08

  7. #7
    Old Enough to Know Better WalterMitty's Avatar
    Join Date
    Mar 2006
    Location
    OK
    Posts
    415
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The popular consensus is that bad cables cause 99% of shifter problems. Complete replacement kits are pretty cheap ($14 - $15) and fairly easy to do. Given the quality of your parts that would probably be the best first move. If it turns out to be something else you may discover it while changing cables and housings.

    If it is something else you'll want new cables on the new whatsit anyway. If they are originals (or just old) you won't get the best performance like you will with new cables.

    I like your Fountain of Smart.

  8. #8
    Neat - w/ ice on the side dalmore's Avatar
    Join Date
    Oct 2005
    Location
    Big Ring. Little Cog.
    My Bikes
    2005 Dahon Speed TR, 2006 Dahon Mu SL, 2000 GT XiZang, 1999ish Rock Lobster, 2007 Dean Animas CTI
    Posts
    1,200
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I didn't get time to stop by the bike shop and pick up cable and housing so I just tore everything down, cleaned, lubed and reinstalled. I didn't see any obvious problems but the guide under the bottom bracket was kind of rough. The cable is bare there so perhaps that's where the problem lies. We'll see what happens now.

    If it happens again I think I'll replace the cable with "sealed" system - housing all the way from shifter to derailer. What would be the downside in doing this other than weight of the extra housing? Surely someone makes an adaptor to attach housed cables to braze-on cable ends - what are they called? It's much easier on my pride to have a name for the part I'm trying to purchase when I walk in the bike shop.
    Current favorite bumper sticker: Wag more. Bark less.

    Change you can believe in - Bigfoot Nessie 08

  9. #9
    Old Enough to Know Better WalterMitty's Avatar
    Join Date
    Mar 2006
    Location
    OK
    Posts
    415
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dalmore
    I didn't get time to stop by the bike shop and pick up cable and housing so I just tore everything down, cleaned, lubed and reinstalled. I didn't see any obvious problems but the guide under the bottom bracket was kind of rough. The cable is bare there so perhaps that's where the problem lies. We'll see what happens now.

    If it happens again I think I'll replace the cable with "sealed" system - housing all the way from shifter to derailer. What would be the downside in doing this other than weight of the extra housing? Surely someone makes an adaptor to attach housed cables to braze-on cable ends - what are they called? It's much easier on my pride to have a name for the part I'm trying to purchase when I walk in the bike shop.
    If you're talking about eliminating the sections of exposed cabling, there's probably not much of a problem with just bypassing them and zip tying the housings to the frame, but there's not much advantage either. I doubt that weight is a factor either way. If I were going to modify anything I would probably try to re-route to the top of the BB or higher. I find myself spending too much time with the BB/chainring acting as a skid plate to want a rear DR cable between me and the rock/branch/mud I'm crashing/riding over.

    If you get a generic kit it will contain all the cable ends you will need. I bought a Giant brand kit from an LBS and it had all ends, ferrules, cables and housings I needed for the whole job. The cutting of the housings is the only tricky part. Depending on how you cut them off they can get crushed and raggedy. You'll have to re-round them and smooth out the ends (paying special attention to the liner) to get smooth operation. A mechanics class instructor made us all liner tools out of sharpened broken spokes.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •