Advertise on Bikeforums.net



User Tag List

Results 1 to 10 of 10
  1. #1
    It's not easy being green FatBomber's Avatar
    Join Date
    Mar 2002
    Location
    Chicago
    My Bikes
    Cannondale Jekyll 700, Jamis Eclipse
    Posts
    437
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Indexing and the Front Derailleur

    I have a new bike and it has a double chainring setup in the front. I was doing some minor adjustments to it and I noticed that when shifting from the small to the large ring, it takes two "clicks" to shift. The same applies to go from the large to the small ring. One click moves it about half way from one to the other.

    My question is this:

    Do I need to adjust my cables to get the indexing right? If so, how is this accomplished? My high and low limits are set perfect right now.

    Merci
    Never trust a limping dog or the tears of a woman.

  2. #2
    Be afraid, be very afraid Zeltar's Avatar
    Join Date
    Nov 2003
    Location
    Southern Ca.
    My Bikes
    03 Habanero Cross, Spicer HT MTB
    Posts
    54
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by FatBomber
    I have a new bike and it has a double chainring setup in the front. I was doing some minor adjustments to it and I noticed that when shifting from the small to the large ring, it takes two "clicks" to shift. The same applies to go from the large to the small ring. One click moves it about half way from one to the other.

    My question is this:

    Do I need to adjust my cables to get the indexing right? If so, how is this accomplished? My high and low limits are set perfect right now.

    Merci

    Yes, then indexing is adjusted by the cable tension. Once you have the upper and lower limits set it is a matter of getting the cable tensioned correctly. If you are installing new cables, you will probably need to adjust again to compensate for the stretching once the cables get broken in.

    It is also a good idea to have the cranks going at the same cadence you would be riding at. If you get good shifting at a low cadence on the stand and then take it our for a ride, it might not shift as well. Just from my personal expierence.

    Good luck.

  3. #3
    Senior Member Ebbtide's Avatar
    Join Date
    May 2003
    Location
    Ohio's Cycling Capital, America's North Coast.
    Posts
    4,618
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    It is also a good idea to have the cranks going at the same cadence you would be riding at.
    It makes me angry when I don't think things like that. It certainly seems to be good info to have, thanks!

  4. #4
    (Grouchy)
    Join Date
    Mar 2003
    Posts
    3,643
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    one of the two clicks could be the trim adjustment. say you're riding on the inner ring up front and the outermost cog in the rear, the chaint might hit the front derailluer, so you'd just do one click to get the derailluer out of the way. same thing if you're using the big ring and largest (innermost) cog in the rear.if the cahin starts rubbing, you adjust the FD accordingly. of course, you could eliminate all this hassle by jsut getting a single speed, but...well, that's not for everyone.

  5. #5
    Senior Member
    Join Date
    Oct 2003
    Posts
    190
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Zeltar
    Yes, then indexing is adjusted by the cable tension. Once you have the upper and lower limits set it is a matter of getting the cable tensioned correctly. If you are installing new cables, you will probably need to adjust again to compensate for the stretching once the cables get broken in.

    It is also a good idea to have the cranks going at the same cadence you would be riding at. If you get good shifting at a low cadence on the stand and then take it our for a ride, it might not shift as well. Just from my personal expierence.

    Good luck.
    That may just not be right.I suspect one of each of the clicks is the trim function in the shifter.

  6. #6
    Senior Member
    Join Date
    Oct 2003
    Posts
    190
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Zeltar

    It is also a good idea to have the cranks going at the same cadence you would be riding at.

    Good luck.
    Cadence is crank revolutions per interval of time.

  7. #7
    Senior Member Don Cook's Avatar
    Join Date
    Sep 2003
    Location
    Memphis TN
    My Bikes
    Raleigh, Benotto, Schwinn, Trek
    Posts
    817
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by FatBomber
    I have a new bike and it has a double chainring setup in the front. I was doing some minor adjustments to it and I noticed that when shifting from the small to the large ring, it takes two "clicks" to shift. The same applies to go from the large to the small ring. One click moves it about half way from one to the other.

    My question is this:

    Do I need to adjust my cables to get the indexing right? If so, how is this accomplished? My high and low limits are set perfect right now.

    Merci
    Would you confirm that what you're talking about is an STI type indexed shifting on a FRONT derailluer that has only two chainrings? And that the front derailluer shifter clearly has three positions?

  8. #8
    It's not easy being green FatBomber's Avatar
    Join Date
    Mar 2002
    Location
    Chicago
    My Bikes
    Cannondale Jekyll 700, Jamis Eclipse
    Posts
    437
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Sure seems that way to me. I tightened the cable and it seems to be operating much better.
    Never trust a limping dog or the tears of a woman.

  9. #9
    Senior Member
    Join Date
    Oct 2003
    Posts
    190
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by FatBomber
    Sure seems that way to me. I tightened the cable and it seems to be operating much better.
    www.parktool.com has the complete drill on FD adjustment.Start at the BEGINNING and do it right. Your shifters if shimano also have have 'half clicks' when in both the big and small ring positions that are trim functions for the FD.

  10. #10
    It's not easy being green FatBomber's Avatar
    Join Date
    Mar 2002
    Location
    Chicago
    My Bikes
    Cannondale Jekyll 700, Jamis Eclipse
    Posts
    437
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I did all that and it was after that I found the "doubleclick". I believe that I neglected to re-tension the cable after adjusting. Seems okay now, but I plan on riding it and shifting it to get some stretch on the cables.
    Never trust a limping dog or the tears of a woman.

Posting Permissions

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