Alu rim + carbon fairing = weight of 2 single material rims, give or take.
It's not a fairing. It's a carbon layer laid up over a very thin aluminium rim section. If it was a fairing it wouldn't have the spoke nipples poking out of it.
@Brommers started
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Alu rim + carbon fairing = weight of 2 single material rims, give or take.