I've spoke to a product manager at ENVE about big guys on CF rims at Sea Otter. They have some clydes in the company nobody breaks rims. Be smart though and go with 32h and the burlier 60/40 AM models. I ride a 29r.
wrt weight differences and Clydes: If feel every gram I shed on my bike, but the reason I'd get carbon wheels is more about the stiffness and control.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Carbon wheels