I'm 6' and both my BB's are L's,but they're Ultras. I'd guess an XL for you.
BarracksSi owns a BB Disc,and he bought my slightly-to-large-for-me Schwinn DBX that was an XL. PM him and ask him what size he rides.
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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
