Quantcast

SRAM on Demo 8 Problem

Discussion in 'Downhill & Freeride' started by pntballpunk51, Sep 11, 2005.

  1. pntballpunk51

    pntballpunk51 Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Aug 15, 2004
    Messages:
    164
    Location:
    clifton *CPT REPRESENT*
    I've been running my sram x.9 on my demo 8 for a little while and I've never been able to shift into my highest (9th) gear because the body of the derailleur hits the derailleur hanger. I don't have pics now but if any of you demo owner's know what I'm talking about please tell me. Thanks.
     

    Please register to disable this ad.

  2. S.K.C.

    S.K.C. Turbo Monkey

    Rep/Likes:
    4 / 10
    Joined:
    Feb 28, 2005
    Messages:
    4,097
    Location:
    Pa. / North Jersey
    ...all you need is some deraileur adjustment. I have a X.O med. cage on my Demo 8 with a 38T ring up front, and it works just fine.
     
  3. freakrock

    freakrock Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Aug 19, 2005
    Messages:
    431
    Location:
    Santiago de Chile
    what's your BB's spindle lenght?
    it seems to me that the chainline might be the problem.
     
  4. The Kadvang

    The Kadvang I rule

    Rep/Likes:
    5 / 0
    Joined:
    Apr 13, 2004
    Messages:
    3,501
    Location:
    six five oh
    works fine for me
     
  5. frznnomad

    frznnomad Turbo Monkey

    Rep/Likes:
    5 / 0
    Joined:
    Jun 20, 2005
    Messages:
    2,229
    Location:
    a-town biatches
    okay you have a few things to try. first check your cable tension, loosen the cable and shift your cable into ninth gear, then pull your cable tight and see if that fixes the problem. next is the derrailure adjustments. thats why those two screws are there. from there make sure your chain line is good. this means you will have to check spindal length and maybee even replace bb. those are the procedures. chainline is the last resort.
     
  6. MDBullit

    MDBullit Monkey

    Rep/Likes:
    4 / 0
    Joined:
    Sep 8, 2004
    Messages:
    274
    Location:
    Bethesda, MD
    just try adjusting the derailleur B-adjustment screw.
     
  7. Dogboy

    Dogboy Turbo Monkey

    Rep/Likes:
    17 / 212
    Joined:
    Apr 12, 2004
    Messages:
    3,128
    Location:
    Chapel Hill, NC
    Make sure you don't have too much chain. If you you do and there isn't enough tension on your rear derailleur, the lower cage will hit the body when you shift into your highest gear.
     
  8. MisterMental

    MisterMental Monkey

    Rep/Likes:
    5 / 0
    Joined:
    Jul 26, 2002
    Messages:
    385
    Location:
    UK
    and too little chain could rip the mech off at bottom out? i dont know what the demo chain stretch is like being fsr but something to check before taking a load of links out/
     
  9. pntballpunk51

    pntballpunk51 Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Aug 15, 2004
    Messages:
    164
    Location:
    clifton *CPT REPRESENT*
    nah its not chainline. i'm going to get my mechanic this week to take a look at it. he thought it sounded like too much chain too. right now i'm not worried about it since my next race isn't until october 1st. I'll try taking some links out this week and get some pics if that doesn't work. thanks!
     
  10. frznnomad

    frznnomad Turbo Monkey

    Rep/Likes:
    5 / 0
    Joined:
    Jun 20, 2005
    Messages:
    2,229
    Location:
    a-town biatches
    okay. easy way that i learned, from an experianced mechanic, is to run the new cahin threw the big ring (or the only ring up front) and the biggest ring in the rear with out running it threw the rear derrailure. pull the chain taught and take out all the usless links. problem solved man.
     
  11. MisterMental

    MisterMental Monkey

    Rep/Likes:
    5 / 0
    Joined:
    Jul 26, 2002
    Messages:
    385
    Location:
    UK
    yeah if its a hardtail
    you wanna take the spring off and cycle the swingarm through its travel as well so as not to snap the chain/rip the mech off at full compression, if you did what you just said to a 223 or smiliar single pivot bike youd be in right trouble but as i said i dont know what the chain growth on a demo is but id check just in case
     
  12. ohio

    ohio The Fresno Kid

    Rep/Likes:
    6 / 4
    Joined:
    Nov 26, 2001
    Messages:
    6,640
    Location:
    SF, CA
    First take the spring out of your shock and bottom it out, then do as you said, but add one full link after measuring. If you go any shorter than that, you will rip your derailleur of your bike, and either brake your chain or pull the wheel out of the quick release. To be really safe you should assemble the drivetrain with chain and cycle the bike through the travel in the big/big combo before putting the spring back on.
     
  13. Dogboy

    Dogboy Turbo Monkey

    Rep/Likes:
    17 / 212
    Joined:
    Apr 12, 2004
    Messages:
    3,128
    Location:
    Chapel Hill, NC
    I ride a Demo 8. There isn't that much chain growth. If he just gets a little tension on the derailleur in the highest gear, that should do the trick.
     
  14. frznnomad

    frznnomad Turbo Monkey

    Rep/Likes:
    5 / 0
    Joined:
    Jun 20, 2005
    Messages:
    2,229
    Location:
    a-town biatches
    woops i forgot one step. you just add two links instead of taking the spring out. just makes the step a little easier, or atleast thats what ive always done that and its always worked for me.
     
  15. pntballpunk51

    pntballpunk51 Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Aug 15, 2004
    Messages:
    164
    Location:
    clifton *CPT REPRESENT*
     
  16. Dogboy

    Dogboy Turbo Monkey

    Rep/Likes:
    17 / 212
    Joined:
    Apr 12, 2004
    Messages:
    3,128
    Location:
    Chapel Hill, NC
    Pull out a little from the derailleur so we can see it better. and do it right side up :blah:
     
  17. julian_dh

    julian_dh Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Jan 10, 2005
    Messages:
    815
    bingo! had the same problem with my orange derailur kept knocking the frame cause it was sitting too close dial out the b adjust until it clears