If the rack has a reflector on the rear,some manufacturers(PB,Cateye) make mounts that bolt onto where the reflector goes. Blackburn makes a seatpost rack with a integrated clip for their lights.
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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,Brompton S6L/S2E-X/M6L-X/S12 T Line
