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With rim brakes, yes, in my experience. It's not so much long descents as steep, twisty descents. If you have to hold the brakes on for long periods of time, and can't let the rims cool down, then you may have issues. There's only so much you can do to increase the glass transition point of epoxy, and ye canna beat the laws of physics, captain. That's why some of my bikes have two sets of wheels - alloy rims for the mountains, carbon for the flatlands of the Fens.
Brommers-
Thanks. I’ve always stuck with shallow aluminium for the best bike as I’m a climber and I take it to Girona / Majorca or somewhere similar every year. Thought maybe in technology had caught up in the last five years.
Very taken by DT Swiss PR 1400 Dicut OXiC but they’re pretty punchy price wise. Still, yolo.
dbr
Are carbon clinchers still unsuitable for long mountain descents?