I built my Surly 1x1 with Rhynolites,BB7 front,Nexus 7/roller brake rear,and skinny 1.3" tires. It's a 18" and weighs 28lbs 1oz. Ditching the gear hub for a fixed one would drop a couple pounds,but it would still be over 25lbs. Not super heavy,but not exactly light. The KM frame is a little heavier I believe,so I think you'd be in the same ballpark. If you're not going to be riding off road,then a road frame will be alot lighter than a MTB frame,and you can always go with an aftermarket fork to run a front disc.
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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
