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So basically that means that in almost all instances, Mavic Aksuims are better wheels than the lighter and more expensive Ksyriums, because Aksiums are more aero?

Yes. This was the big joke about the R-Sys recall - Mavic free-issued Aksiums to people while the R-Sys problems were sorted, and anybody who bothered to conduct proper tests would have discovered that their new 'free' wheels were actually faster than the exploding wheels they had just wasted £1000 buying.