I wanted one of these,but the local dealer doesn't stock them and wouldn't do a custom order.
Axiom does racks that work with discs.
http://www.axiomgear.com/product/racks/
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X