Joined: Oct 2013
Posts: 600
Likes: 159
From: In a boat
Bikes: 1990 Specialized Sirrus Triple, 1985 Trek 460, 2005 Lemond Tourmalet, 1984 Schwinn LeTour 'Luxe, 1988 Trek 400T, 1985 Trek 450, 1997 Lemond Zurich, 1993 Diamond Back Apex, 1988 Schwinn Circuit, 1988 Schwinn Prologue, 1978 Trek TX700, Sannino
Check the seatpost size. Mine also has Gipiemme dropouts and is marked Columbus Tretubi. It takes a 27.2 seatpost so that would likely make it a SL main triangle. Weight was around 4 pounds for a bare 56cm frame. Italian bb thread.