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Dura Ace C35 clincher "wrinkle" (delamination?) safety question

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Dura Ace C35 clincher "wrinkle" (delamination?) safety question

Old 04-23-19, 11:41 AM
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Dura Ace C35 clincher "wrinkle" (delamination?) safety question

A picture is worth a thousand words:

On C35 clinchers the non-brake-track area is comprised of alloy, then carbon, and finally an outer clearcoat. It's not cracked; it's "wrinkled" (not sure if "delamination" is the term I should be using). I spent some time searching, found posts with photos showing obvious breaks/cracks, but nothing with a "wrinkle" like this.

I checked if I could 'push' the wrinkled area, if I could 'bend' the wheel, spoke tension, if the wheel remained true, etc. All OK. I rode it for a further 25 miles. No change to ride quality. I'm guessing that I hit a bump at just the right angle, with just the right weight distribution, etc. for the rim to have "wrinkled" as shown.

My thinking is "not cracked, further 25 mile ride ok, so no immediate danger - but MUST be checked before each ride".

Your opinion? Should I be more concerned? Would there be value in putting some form of epoxy over the "wrinkled" area?

Thank you.
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Old 04-23-19, 12:01 PM
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Originally Posted by JohnnyCyclist View Post
A picture is worth a thousand words:

Those "words" are mumbled.
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Old 04-23-19, 12:14 PM
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Old 04-23-19, 12:27 PM
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I would ride them super hard at low speeds. Bring them through the ringer. If they held up, I would continue to ride without fear.

I bought a pair of DA C60's for an absolute steal because the guy felt a throbbing by braking on prolonged downhills. I rode them, he was right, but it was light. I researched and found that Shimano had used aluminum for the braking surface and another material for the welding compound on the joints. This caused a difference in thermal expansion between the alu and joints during prolonged braking. I didn't feel that it was significant enough to be a safety hazard. But one must determine for themselves what risks to take.

If the wheels are new, I would send it in for repair or replacement.

If I had built the wheels myself, this kind of thing would never happen.
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