I have the Nashbar frame with disc brakes. If you get a disc compatible rack it'll go on pretty easily. I'm using the a Topeak one:

http://www.topeak.com/products/Racks...bularRack_disc

Mounting fenders with that rack is a little harder. Since the rack has a built in spacer to keep it away from the brake you can't mount the fender stay with the same bolt as the rack. I ended up using P-clamps to attach my fenders to the rack.