i like the idea of the short options from goldix, but wouldn't trust the construction. is the axle aluminium? 24 mm steel axle on the shimano hollowtech ii is a bombproof system that lasts a very long time, much longer than anything with an aluminium axle, even when they are thicker. e.g. i'd get a deore over 5dev any time just because of the reliable axle. that's not to say they're unsafe, not at all, but the steel bearings wear into the softer aluminium axle