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Monolithic disc? Yeah, they all do that. As the periphery heats up and expands, the lowest energy state becomes a pringle if the energy required to form that bend is lower than the energy required to elongate the spoke elements of the disc. Might be a sign that it would be a good idea to switch to a floating rotor.
gbj_tester
frank9755
Out on the tandem on Sunday for a hilly ride in the Chilterns. On one steep descent, where I had to slow for a hairpin, then again for a right turn, I looked down and saw the front disc was well out of shape, like a pringle. It went back to flat as it cooled down over the next minute or so of normal riding.
First time I'd seen this, although I had heard strange noises after big descents before.
Is that normal?
Have I done any long term damage?
When that happens is it a sign to basically stop and let it cool before more descending?