I have never been touring or purchased a rack but I am building some touring bikes now for my girlfriend and me. So here is my question. Both bikes have the standard braze-on mounts near the rear dropouts. However, the top mount is a single braze-on located on the cross beam spanning the seatstay (right behind the straddle yoke for the brakes). I am more used to seeing two mounts on the outside of the stay.
Do all racks allow the use of this single central mounting point or do I need to buy some sort of adapter?
Thanks in advance.