I put a Blackburn Mtn. Rack (seemed appropriate) on my KOM-10. I don't have a rear brake clearance problem because mine is mounted (for better or -- mostly -- worse) under the chainstay, but the Mtn. Rack should be able to clear a RollerCam on a seat stay bridge. (I also had to use seat stay clamps because the KOM-10 lacks mudguard or rack eyelets of any kind.)
Speaking of under-the-chainstay rear brakes -- has anyone ever seen a RollerCam in this application? The U-brake I have makes a lot more sense to me, but at least I have the RollerCam up front.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069