Carbon bars slipping in stem ... what's wrong?
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  1. #1
    RoadBikeReview Member
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    Carbon bars slipping in stem ... what's wrong?

    I have a 31 mm Stella Azurra Vice Versa stem and I can't seem to keep carbon bars from slipping at the prescribed 5 N*m of bolt torque. I am careful to tighten them in small amounts alternatively and sequentially to the desired torque, e.g., top right bolt a quarter turn, then bottom left quarter turn, etc., etc.

    They stay snug until I hit the occassional unseen bump and then, with a loud noise, twist just enough to piss me off. Enough bumps and they need readjustment. When I examine the bars, I note that some of the clear cote on the bars has come off and you can see where the stem has ever so slightly squeezed the carbon a bit. This was the case with my prior Modolos and is now the case with my Kestrels, so I don't think it's the bar.

    What adivce to keep em from slipping? Thanks.

  2. #2

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    It sounds obvious but you should tighten it until the bar is secure. Bike component manufacturer torque specs are notorious for being incorrect.

  3. #3
    RoadBikeReview Member
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    chalk?

    I don't own carbon road bars but I know chalk will work on carbon seatposts. I had a carbon seatpost on an MTB that refused to stay put. I rubbed sidewalk chalk on the post and it never slipped again.

  4. #4

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    put a small piece of cardboard, like from a cereal box, around the bar, once piece, but not all the way around the bar, cut it to size so it fits concealed by the handlebar clamp.

    I used this trick with Easton carbon bars and a Easton Mag stem and the bars never slipped.

    Tighten the stem bolts until they are snug and tight. Use a little grease on the threads to prevent them from stripping.
    "...makes you strong like Ox!"

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