well hello...i gotta pretty silly question i was just thinking about....can u use a 20mm hub with say a 15mm fork or maybe say a regular QR fork...just wondering
DT Swiss 240s oversize hubs are good at this. 20mm, 15mm, 9mm, QR all by changing the end caps (about $35 for a set of caps). I9s and chris king hubs come to mind also. But I'll let someone else chime in on the particulars.