I have the Baer 6S and have recently upgraded from the original 14" to 15" rotors and they fit with 20" Alcoa's.
This is the clearance with 20" Alcoa's..........
I would think the caliper clearance would be there for a 19" wheel, but do the wheel spokes have a curvature on the inside to clear the caliper when it is located further out with the 15" upgrade?