I don't recall ever hearing them calld "Dandy Horses" butI had seen pics where things like this were called Hobby Horses
http://en.wikipedia.org/wiki/Karl_Drais
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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