Advertise on Bikeforums.net



User Tag List

Results 1 to 12 of 12
  1. #1
    Senior Member
    Join Date
    Jun 2006
    Posts
    159
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Long Cage Derailleur with Double Crank

    I took the rear derailleur off my bike, and replaced it with an ultegra 9-speed long cage derailleur. I have a 12-25 8 speed cassette in the back, and 53/39 in the front. I used the same chain that I was using with the old derailleur (a short cage dura ace 9-speed) - the length appears to still be correct. It will shift into all of the gears, but it clicks a lot in the gears on the big ring.

    From what I can tell, it looks like the chain doesn't sit quite flat on the outer derailleur pully - its a bit off to the side. Adjusting the limit screws doesn't seem to help this. The derailleur cage doesn't seem to be bent.

    Does anyone have ideas on what could be causing the derailleur to act like this - is it the long cage with a double, or could something be worn out (I got the derailleur used at a LBS - not sure about its history)?

  2. #2
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,145
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Phoible
    I took the rear derailleur off my bike, and replaced it with an ultegra 9-speed long cage derailleur. I have a 12-25 8 speed cassette in the back, and 53/39 in the front. I used the same chain that I was using with the old derailleur (a short cage dura ace 9-speed) - the length appears to still be correct. It will shift into all of the gears, but it clicks a lot in the gears on the big ring.

    From what I can tell, it looks like the chain doesn't sit quite flat on the outer derailleur pully - its a bit off to the side. Adjusting the limit screws doesn't seem to help this. The derailleur cage doesn't seem to be bent.

    Does anyone have ideas on what could be causing the derailleur to act like this - is it the long cage with a double, or could something be worn out (I got the derailleur used at a LBS - not sure about its history)?
    Have you tried adjusting the cable tension with the barrel adjustor?
    Be sure you have enough chain so that the derailleur does not reach its limit when the chain is on the big chainring and biggest cassette cog.
    Don't understand why you'd want to change to a long cage derailleur if the short cage was OK.

    Al

  3. #3
    Unique Vintage Steel cuda2k's Avatar
    Join Date
    May 2005
    Location
    Allen, TX
    My Bikes
    Kirk Frameworks JKS-C, Serotta Nova, Gazelle AB-Frame, Fuji Team Issue, Schwinn Crosscut, All-City Space Horse
    Posts
    11,486
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Describe what you mean by "off to the side" a bit more. I'm having a hard time picturing it. And have you isolated exactly what is making the 'clicking' noise?
    [CENTER][URL="http://VeloBase.com"][IMG]http://velobase.com/App_Themes/VeloBase2_blue/Images/VeloBase2TitleCampagnolo.jpg[/IMG][/URL][/CENTER]
    [CENTER][URL="http://JonPFischer.com"][COLOR="#006400"]Fischer Photography[/COLOR][/URL] - [URL="http://www.bikeforums.net/showthread.php/785462-My-new-modern-quot-Classic-quot-Kirk-JKS-Classic-Terraplane"][COLOR="#8b0000"]Kirk Frameworks JKS-Classic Build Thread[/COLOR][/URL][/CENTER]

  4. #4
    Senior Member
    Join Date
    Jun 2006
    Posts
    159
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Have you tried adjusting the cable tension with the barrel adjustor?
    Yes. If I tighten the barrel adjuster, the derailleur jumps to the next cog up.

    Be sure you have enough chain so that the derailleur does not reach its limit when the chain is on the big chainring and biggest cassette cog.
    Big/Big seems to work. It just makes noise.

    Don't understand why you'd want to change to a long cage derailleur if the short cage was OK.
    I wanted the derailleur off of that bike for a bike that I was building up. I put on the long cage because it was lying around, and I figured that it should work.

    Describe what you mean by "off to the side" a bit more. I'm having a hard time picturing it. And have you isolated exactly what is making the 'clicking' noise?
    The pulley should be centered above the chain. I think that it isn't - the pulley runs along one edge of the chain, and skips as it pops in and out of the grooves in the chain.

    I may try adding a link to see whether that helps. I didn't think that the cage length should affect the required chain length.

  5. #5
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,898
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm wondering if your derailleur hanger is mis-aligned.

    I'm thinking that it might work with a short cage rear derailleur but the longer cage will exagerate the misalignment and might make just enough difference to cause the problem that you're describing. Check your bike from the back to see if the derailleur arm looks like it's exactly parallel to the cassette cogs.

  6. #6
    Senior Member
    Join Date
    Jun 2006
    Posts
    159
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I'm wondering if your derailleur hanger is mis-aligned.
    I'll have to check. I crashed earlier this year, and bent my derailleur hanger. I paid a LBS to true it, but its possible that they screwed it up.

  7. #7
    Unique Vintage Steel cuda2k's Avatar
    Join Date
    May 2005
    Location
    Allen, TX
    My Bikes
    Kirk Frameworks JKS-C, Serotta Nova, Gazelle AB-Frame, Fuji Team Issue, Schwinn Crosscut, All-City Space Horse
    Posts
    11,486
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Yup, sounds like the LBS got it well enough for the short cage, but Retro is right, the longer cage will exagerate it.
    [CENTER][URL="http://VeloBase.com"][IMG]http://velobase.com/App_Themes/VeloBase2_blue/Images/VeloBase2TitleCampagnolo.jpg[/IMG][/URL][/CENTER]
    [CENTER][URL="http://JonPFischer.com"][COLOR="#006400"]Fischer Photography[/COLOR][/URL] - [URL="http://www.bikeforums.net/showthread.php/785462-My-new-modern-quot-Classic-quot-Kirk-JKS-Classic-Terraplane"][COLOR="#8b0000"]Kirk Frameworks JKS-Classic Build Thread[/COLOR][/URL][/CENTER]

  8. #8
    Senior Member
    Join Date
    Oct 2005
    Location
    Ormond Beach, FL
    My Bikes
    2005 Specialized Roubaix Elite
    Posts
    219
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by cuda2k
    Yup, sounds like the LBS got it well enough for the short cage, but Retro is right, the longer cage will exagerate it.
    I don't understand why the longer cage would exaggerate the shifting problem. The longer cage simply places the tensioner pulley farther away from the axle so it can take up more slack, but the guide pulley appears to have the same relationship to the axle (and the cassette cogs).

  9. #9
    Senior Member barba's Avatar
    Join Date
    Nov 2005
    Posts
    4,083
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bob Pringle
    I don't understand why the longer cage would exaggerate the shifting problem. The longer cage simply places the tensioner pulley farther away from the axle so it can take up more slack, but the guide pulley appears to have the same relationship to the axle (and the cassette cogs).
    The same angle but a longer arm would mean more deflection.

  10. #10
    Senior Member
    Join Date
    Oct 2005
    Location
    Ormond Beach, FL
    My Bikes
    2005 Specialized Roubaix Elite
    Posts
    219
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by barba
    The same angle but a longer arm would mean more deflection.
    Right! But the longer arm(s) carry the TENSIONER pulley, which has practically nothing to do with shifting the chain laterally on the cassette cogs. It's the GUIDE pulley that does the shifting, and it's just as close to the cassette in a long cage derailleur as the guide pulley in a short cage derailleur.

    Not trying to be a wise-(guy) here, but I don't understand the reasoning.

  11. #11
    Senior Member Retro Grouch's Avatar
    Join Date
    Feb 2004
    Location
    St Peters, Missouri
    My Bikes
    Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
    Posts
    23,898
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Bob Pringle
    Right! But the longer arm(s) carry the TENSIONER pulley, which has practically nothing to do with shifting the chain laterally on the cassette cogs. It's the GUIDE pulley that does the shifting, and it's just as close to the cassette in a long cage derailleur as the guide pulley in a short cage derailleur.

    Not trying to be a wise-(guy) here, but I don't understand the reasoning.
    Because the OP said the shifting was OK but the chain was off to the side of the outer pulley.

  12. #12
    Senior Member
    Join Date
    Jun 2006
    Posts
    159
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It shifts fine, but makes noise. Looking at the hanger, it might be bent just a touch inward. Which would make sense given the symptoms. I may just put on a short cage derailleur and call it a day.

Posting Permissions

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