Some aero’ wheels are an aluminium rim with a carbon fibre shroud. On a Mavic Cosmic SLS rear wheel, I’ve found that the carbon fibre shroud is separating from the aluminium rim. Just visible in the photo, it is delaminating in the same place on both sides over a length of about 10cm: enter image description here

Other side with a pick to show the separation: enter image description here

It’s something I’ve seen before, so to me it’s a known issue- but I don’t know what the solution is. It makes a 1/Rev creaking noise which is a nuisance and I don’t know how quickly it will deteriorate.

At the moment it doesn’t show any damage, it is just separating from the rim. Is it rideable? Is it fixable? Or is the wheel finished?

  • 1
    From the wear pattern on the rim, it looks to me like the brakes are adjusted too far down. May 11, 2019 at 22:01
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    @Daniel yes the left pad was slightly too far down, but it hasn’t worn a lip to contact the carbon yet. And the right hand side pad was adjusted fine and rhs is also delaminating. Added mystery! I’m not so concerned with the why it happened, but with knowing what to do about it.
    – Swifty
    May 13, 2019 at 11:22
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    The carbon part has in fact no load bearing function The SLS is a standard aluminium rim with a glued on light carbon fairing for aerodynamic purposes.
    – Carel
    May 14, 2019 at 8:02
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    As @Carel says, the carbon section isn't providing any strength to the wheel. You could probably either A) glue it back on, or B) cut it off and what you have left is probably a ksyrium
    – Andy P
    May 14, 2019 at 8:15
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    @Swifty, Did you ever find a fix for this issue as I have the same on my Mavic wheel?
    – Brendan
    Oct 16 at 12:29


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