Most 26" prebuilt wheelsets are for MTB's,so your best bet would be to have some built for you. You could also keep an eye on eBay and CL. My Marins and Buzz are 26",so they are out there,you just need to do some digging.
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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
