Since most hub manufacturers use proprietary freehubs, you'd have to hope that a manufacturer who makes your 150mm hub also makes a 135mm SS hub with the same freehub interface, at which point you might as well just buy the 135mm hub :-) That would certainly save the trouble of making a 135×10 axle to fit a 150×12 hub.
Since most hub manufacturers use proprietary freehubs, you'd have to hope that a manufacturer who makes your 150mm hub also makes a 135mm SS hub with the same freehub interface, at which point you might as well just buy the 135mm hub :-) That would certainly save the trouble of making a 135×10 axle to fit a 150×12 hub.