IF, as I am now beginning to surmise is the case, IF a 1400 wheelset is legacy tech from the downtube shifter days and a 7300 is more current issue .... WHY is this even being considered? Is it to have an alternate size for gravel or something? Doesn't look like it. Given that going from one to the other will not be a simple swap out/swap in ... what would be the attraction of using a decades old wheelset in a more recent bike?