Ron I use this bracket from choppers us to mount my disc brake,and if you wont to put a spocket on 144 spoke rim you need to remove a few spokes,I removed 9 spokes and sprocket went right on heres the link for the bracket,you might need a hub adapater aswell i also put the link where i bought mine.
Disc Brake Bracket Billet - Choppers U.S., LLC
BicycleDesigner: Your one stop source for lowrider bike and chopper.
Disc Brake Bracket Billet - Choppers U.S., LLC
BicycleDesigner: Your one stop source for lowrider bike and chopper.