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carbon steerer

Discussion in 'Bicycle Mechanics and Repairs' started by bonj2, 13 Apr 2008.

  1. bonj2

    bonj2 Guest

    is there anything special you need to do differently when fitting forks with a carbon steerer?
    It's got an 'expanding wedge bung' already in for the top cap bolt to screw into so that's ok, but I'm thinking - it's ok to just tighten the stem bolts on it as you would normally or do you have to have something else in there above the wedge bung thing?
     
  2. TheDoctor

    TheDoctor Man-Machine Staff Member

    Location:
    Stevenage
    As far as I know you just don't want to go mad doing the stem bolts up. My expanding bung thing ended up just where the stem clamps on.

    Someone else will be along to give their two penn'orth soon.
     
  3. Smokin Joe

    Smokin Joe Legendary Member

    You really need a torque wrench if you are not experienced enough to have developed the feel for tightening clamps round carbon tubes. Overtighten and you will crush the steerer with disasterous consequences.
     
  4. TheDoctor

    TheDoctor Man-Machine Staff Member

    Location:
    Stevenage
    Ulp!
    Well, I didn't really welly it up.
    *worries*
    *goes to check*
     
  5. OP
    OP
    bonj2

    bonj2 Guest

    cheers Joe
    what should the torque be, for when I do get a torque wrench?
     
  6. Piffle. How exactly does one 'develop the feel'? Precisely how many carbon steerers have you crushed joe?
     
  7. OP
    OP
    bonj2

    bonj2 Guest

    don't you reckon you do need a torque wrench then mickle?
     
  8. OP
    OP
    bonj2

    bonj2 Guest

    ah, shoot! i've just discovered the wedge bung thing is too far down for the top cap bolt to reach. Is it likely to be possible to pull it up a bit?
     
  9. Dave5N

    Dave5N Über Member

    You need a long screwdriver and a hammer. Alternatively cut it at the point where the bung is stuck. Make sure you use the right adhesive to reassemble - ideally an epoxy resin (such as araldite) as the chemical composition is the same as the carbon matrix.
     
  10. Use a longer bolt....
     
  11. WTF??
     
  12. OP
    OP
    bonj2

    bonj2 Guest

    eh?:eek: I dont' want the steerer any shorter than it is so I'm not going to cut it. I don't understand the rest. What would I use a hammer and screwdriver for, and why would I need to reassemble it with glue?
     
  13. OP
    OP
    bonj2

    bonj2 Guest

    hmmm.. that was my first thought, I could do - but do I not want the bung inside at the point where the stem is going to be tightening on it?

    i'm tempted to just get this fella
     
  14. Don't worry about where the expander is in relation to the stem. It'll cope.
     
  15. OP
    OP
    bonj2

    bonj2 Guest

    can you get longer top cap bolts?