The only pictures I can find of the Mach 2 makes them look fairly shallow. Maybe it's just a weird picture, but I'm definitely looking for something 20mm+ in depth. The number of holes isn't an issue at this point, since I don't have hubs yet. I did look at Velocity, and I'm considering the Pro Elites (30mm tubulars), but I figured I'd see if there was any cool retro rims I could find that fit the bill.