I have the same 30 hole Zeus hubs and rims. I'm not a wheel builder but b asic math says the root numbers for 15 are 1,3 and 5. This tells me that you can spoke a 30 hole rim either radially (1) or have 5 sets of (3) cro ssed spokes per side. In theory I guess you could have 3 sets of (5) cros sed spokes per side; not sure this would be practical or doable. Scott Edrington San Diego, CA USA