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DrDave
Never heard that before and was curious so i had a look around and apparently its because some carbon rims can be rough on the inside of the bead hook which can cause damage/rough up or potentially fray the fibres on the tyre bead due to the spun fiber construction. So if your rims are smooth already or can be with a little careful wet and dry or even line the inner bead of the rim with a little tape you should be fine i reckon. A decent wheel builder would be able to tell you for sure