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?

  • From the wear pattern on the rim, it looks to me like the brakes are adjusted too far down. – Daniel R Hicks May 11 '19 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 '19 at 11:22
  • I see what appears to be a wear mark, just above and to the right of the label. – Daniel R Hicks May 13 '19 at 11:48
  • What sort of noise are you hearing? – Daniel R Hicks May 13 '19 at 11:49
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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 '19 at 8:15

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