Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Member
    Join Date
    Apr 2009
    Posts
    37
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    High effort needed to downshift chainring

    My Ultegra brifter requires a lot of effort to shift down from the large chainring and clanks when it finally shifts. This came on suddenly, during a ride, prior to which it had been shifting smoothly, with light effort. I tried loosening the upper limit screw, thinking that perhaps there was too much tension on the cable when trying to downshift, but that seems to have little to no effect. Next step is to take it to LBS for an expert to fix. Any suggestions before I do that?

  2. #2
    Senior Member Matt Gaunt's Avatar
    Join Date
    Oct 2004
    Location
    London, UK
    Posts
    2,217
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Lube your cable and brifter internals. Could be a bit of gunk clogging up the release mechanism in the shifter itself.

    Edit: also lube all the joints on your front mech after spraying some WD-40 in there whilst moving the cage by hand.
    Matt
    2010 Kinesis Decade Convert2 Alloy fixie, Miche, Sora Pics soon...
    2008 Kinesis RC2 Scandium/Carbon Road, Ultegra, Ksyrium Elites Pics
    2007 Kinesis Pha5e Scandium hardtail, XT, Revelations, Rockets, M4s, Mavics Pics
    2005 Kinesis RC Scandium/Carbon Road, Ultegra, Ksyrium SLs Pics
    1996 Raleigh Max Steel, Deore XT, SRAM Attack shifters, homemade wheels Pics

  3. #3
    Senior Member
    Join Date
    Apr 2006
    Posts
    1,024
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If the cables are around 1 year old, replace them because if it breaks in the shifter, then you have a bigger problem.

  4. #4
    Senior Member
    Join Date
    Mar 2007
    Location
    Louisville, KY
    My Bikes
    Trek Madone 5.5, Klein Q Pro Elite, Surley LHT
    Posts
    469
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sounds to me like you need a new cable and housing. Disconnect the cable from the derailleur and than **** the brifter. If the shifter is hard to move replace the cable and housing. If the shifter moves easily your problem is the derailleur.

  5. #5
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 5500, Colnago C-50
    Posts
    9,087
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Look for possible kinks in the cable and housing.
    Check the cable guide under the bottom bracket. Clean if needed.
    Shoot WD40 into the shifters.
    Moving the limit screw was not the thing to do. Adjust the screw according to instructions found at www.parktool.com.

  6. #6
    Senior Member oldbobcat's Avatar
    Join Date
    Jul 2005
    Location
    Boulder County, CO
    My Bikes
    '79 Gios, '80 Masi, '06 Felt, early '60s Frejus
    Posts
    2,455
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Slodad View Post
    This came on suddenly, during a ride, prior to which it had been shifting smoothly, with light effort. I tried loosening the upper limit screw, thinking that perhaps there was too much tension on the cable when trying to downshift, but that seems to have little to no effect. Next step is to take it to LBS for an expert to fix. Any suggestions before I do that?
    Are you running triple or double chainrings?

  7. #7
    Senior Member
    Join Date
    Oct 2011
    Location
    SF Bay Area
    My Bikes
    2003 Lemond Zurich; 1987 Schwinn Tempo; 1968 PX10; 1978 PX10LE, Peugeot Course; A-D Vent Noir
    Posts
    428
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sounds like the FD got twisted on the tube (it's a clamp on, right?), bent, or the cable got pulled out a bit. Loosen everything, reallign the FD cage, and adjust and tighten everything the way you would when tuning up the shifters. Also check the chain and chainrings for wear. Why did the chain come off in the first place?

  8. #8
    Member
    Join Date
    Apr 2009
    Posts
    37
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Lubricating all the pivots on the FD improved things immensely. Thanks for the tips.

Posting Permissions

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