I’m suspecting that (as per Dango) it’ll turn out to be one the these axle designs that are now advertised as 12×142, because that’s what the manufacturer currently sells as a hub/dropout/axle system. The 135/142 dimension is the internal dropout measurement, but all of them are 150 external dropout measurement. It almost doesn’t matter about 135/142, it’s the design of the end bits, Syntace X-12 design, Sram Maxle design, E-Thru, camming action of axle, thread length of axle, external dropout inserts and/or machining, threaded dropout(X-12). I’m thinking it could be E-Thru, it looks to me like E-Thru is everyone elses version on the Sram Maxle, the fact that they all state 12×142 for E-Thru might be a red herring as that’s just Hub and internal dropout design. I might be wrong tho.