Lots of people selling bikes on CL simply have no idea what size the bike is. I wouldn't go near that Guerciotti especially at $900. back in the very early '90s the only two I ever saw were broke, one of the joints came apart.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk