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Not sure how easy it will be to find 20H disc hubs, but in terms of general wheel strength it might be fine. Depends how gnar the mac is, and how hard you hit it. I'm pretty relaxed about 20/24 with rim brakes on anything signposted footpath/cyclepath/bridleway, and I'm 15kg more and I expect you're looking at deeper rims than DT R24
gbj_tester
20/24 carbon rims a bad idea for a disc road/gnarmac bike and 87kg rider?