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Wall thickness appears to be 4.5mm but the ends of this particular axle are plugged. The idea was just to get an indication of what stiffness we are dealing with. If the deflection had been 6.0 mm conclusion would have been different. Kevin W's link brings up the usual. i.e. this topic has been discussed at length before when this forum was more popular and heated , the 'search' facility brings up all sorts. I don't think there are any weight advantages Chris unless you need ballast. . The front stubs are obviously heavier and seem out of proportion in stiffness to the attachment to the frame. The 50 mm axle though 'thin walled' , is still about 70% of the weight of the 30mm axle, and the bigger bearings needed will make up the difference imo. You then have the disadvantage that 'normal ' rims will not go over the axle so you can't move the rears in , and the axle must be almost impossible to straighten if damaged.
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