I'm looking for a disc frame along the lines of a Planet X Kaffenback swap-out, around size 50cm, to build an all around bike for the significant other. If only it was a little lighter, that'd be great. Any alternatives in that price range? Thanks.

Edit: Oh there's the "Uncle John" as well, that seems to fit the bill.

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Bikes: Raceur, Haqueur, Grindeur

The Nashbar X frame is available in 50cm. Pretty budget friendly too.

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Trek 5500 - 13.75lbs on a $1400 Budget
20 gram 1x10 chain guide