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@Dammit
The issue with carbon fibre rims is one of heat- whilst alluminium (being a metal) conducts heat very well, carbon fibre is essentially an insulator, and holds onto heat rather than conducting it away.
So, high, but within tolerence tyre pressure for a rim can turn into a pressure that is far too high for a rim that is starting to soften due to heat.
What happens I hear you ask?
Typically, our hero is descending a steep hill, on the brakes a lot, when the rim either deforms outward dramatically, sometimes locking the wheel, or simply spits the tyre off, both of these under brakes.