Advertise on Bikeforums.net



User Tag List

Results 1 to 8 of 8
  1. #1
    Newbie
    Join Date
    Sep 2008
    Posts
    4
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Front derailleur shifter

    Hi All

    Currently, my bike is Shimano 105 9-speed equipped. Most of the time, I like a gear ratio where the chain is on the largest gear on the crankset and on a large gear on the rear sprocket (english is not my first language, please correct me). This makes the chain rub on the front derailleur cage, which annoys me, in addition to prematurily wear the derailleur.

    Is there a lever out there that would allow me to fine tune the position of the front derailleur? I remember that my old Deore XT left shifter allowed me to do this, if I remember well from my mountain biking memories.
    Trek 1500 SLR

  2. #2
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 510, Trek 5500, Colnago C-50
    Posts
    8,871
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by michou View Post
    Hi All

    Currently, my bike is Shimano 105 9-speed equipped. Most of the time, I like a gear ratio where the chain is on the largest gear on the crankset and on a large gear on the rear sprocket
    This is called "cross-chaining" and should be avoided. Forcing the chain to run on an extreme angle causes excessive wear in the drivetrain, chain, sprockets, and derailleurs. Just don't do it. The cross-chaining ratios are redundant with other gear combinations and are not needed.

    Al

  3. #3
    Newbie
    Join Date
    Sep 2008
    Posts
    4
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Hi

    Thanks for you answer. This is not an extreme cross-chaining as the position on the sprockets is the 3rd one, out of 9.

    The convenience for me is that I can start from on a complete stop on the 3rd position and then shift to higher speeds easily, from the 3rd to 4th, 5th, etc. It would be a little annoying to have to change the front gear and also the rear gear to achieve this.

    What do you seasoned cyclists do?

    Maybe it is just a simple adjustment, because the rubbing is not constant, but only when I put lots of pressure on left crank, like when climbing, which makes me think that the BB set is not stiff enough.
    Trek 1500 SLR

  4. #4
    Senior Member CACycling's Avatar
    Join Date
    Feb 2008
    Location
    Oxnard, CA
    My Bikes
    '08 Fuji Roubaix RC; '07 Schwinn Le Tour GS; '92 Diamond Back Ascent EX
    Posts
    4,390
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    This can probably be corrected with an adjustment of the FD. The first response to this assumed (as I did when I first read it) that you were going "Big Big" (as in largest front chainring to largest rear cog) which isn't a good idea. 3rd cog down should be OK.

  5. #5
    No matches Flatballer's Avatar
    Join Date
    Aug 2008
    Location
    Charlotte, NC
    My Bikes
    two wheeled ones
    Posts
    10,182
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    On modern bikes, I've read Sheldon Brown saying that cross-chaining isn't a big deal anymore because derailers are better and chains are more flexible.
    It's a bike race, not a tea party. - GirlAnachronism

  6. #6
    Newbie
    Join Date
    Sep 2008
    Posts
    4
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Thanks. I will try that!
    Trek 1500 SLR

  7. #7
    Senior Member
    Join Date
    Feb 2005
    Location
    Oklahoma
    My Bikes
    Trek 510, Trek 5500, Colnago C-50
    Posts
    8,871
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    What you need is a shift cable adjustment. Use the barrel adjuster usually found on the left side of the down tube.

    Al

  8. #8
    Low car diet JiveTurkey's Avatar
    Join Date
    Aug 2007
    Location
    Corvallis, OR, USA
    My Bikes
    2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
    Posts
    2,359
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Al1943 View Post
    What you need is a shift cable adjustment. Use the barrel adjuster usually found on the left side of the down tube.

    Al
    To add, you need slacken the cable (that is, make it "longer"), so tighten the barrel adjuster (righty-tighty, which makes the housing shorter and cable relatively longer).
    Quote Originally Posted by slopvehicle View Post
    Not wearing a helmet makes me more aware of my surroundings. I find myself anticipating the hardness of concrete 50 or 100 feet in front of me, it's almost a zen-like connection between my face and the pavement.

Posting Permissions

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