i have seen cheaper wheels on the IRO website.........[url]http://www.irocycle.com/fixedgearandsinglespeedbikeframesfromirocycleinc/id67.html ............are these any good? They are velocity aeroheads, how do i find out what spacing i need in the rear? also, since im on such a budget how about IRO's other parts (hubs, cranks?). If i were to convert this current frame, would most of the parts actually fit on a newer track frame later on?