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gbj_tester
Stiffness isn't the point. You can make a 15mm axle stiffer than a 24mm DA axle if you make it out of enough material :)
The goal is good enough stiffness at minimum weight, and having 30mm to play with and only needing to fill a 68mm shell, Cannondale could make their axles out of hollow aluminum rather than steel, reducing the system weight but keeping the stiffness where it needs to be.