Originally Posted by
rickrob
What determines if an axle is male or female-- If it uses a bolt or a nut for the crank arm?
Correct. Most Campagnolo BB axles are "female" in that a bolt is threaded into the axle to mount the crank arms. After breakage issues with the first generation of titanium Super Record axles, Campagnolo changed the Super Record axle to a "male" axle, onto which a nut is threaded to mount the crank arms.