Maybe you could search for the information on hub manufacturers websites or search for drawings of those other hubs also and add the information to that thread. Or ask on that thread for people with each type of hubs to measure and post the bearing spacing or required axle width.
If it is relevant and important information (at least to you) maybe finding and sharing it with others on that compendium thread would be a useful contribution.
Google found me this:
TRAMPA Superstars it is 34mm.
(This is typical for skate wheels so expect many others could be similar?)
