Somebody nab this one.
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1987 Cannondale st400 - $100
Nearest I can figure I have the correct model/year you'd probably want to verify for yourself though. Got it from a friend and it's just been sitting for a while now. It's a pretty small frame I'm no bike expert but I'd say under 53cm I'm 5'8 and it seems a bit small for me. It needs tires and some love but was in ridable condition before sitting for so long.
Price is OBO please call/txt w/ any questions