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Yeah, my tyres are ~27mm so they're definitely an aero disadvantage but fitting the 808FC rear would shave some weight over the old 808, give me wide rim for the fat tyres I run and perhaps be more aero. Also, using Raltech covers would be lighter than my Aerojackets and the G3 would be lighter than my current SL. Braking would be shitter that's about the only disadvantage.
Super 9 is probably the only disc worth upgrading to, not going to be much difference between all the others + you'll benefit from the wide rim. You run massive tyres for 24hrs right? You might be fucking up your 808fc aeros with a >23c tyre.