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@hbmagpies
^^ Top tube CTC is 56cm (so it's 56cm square).
Regarding stiffness, these bikes traditionally have less lateral stiffness then other alu frames due the light weight small gauge tubing and construction method (bonded rather then welded), but this also means that they are far more comfortable then the average bike. I wouldn't recommend this if you were 90kgs or above or if you intend to ride it everywhere aggressively, but as a cruiser (i was going to build it with portuer bars, magic gear and a coaster brake), he'd be unstoppable.
There are some bad stories out there regarding bonded frames such as these, but as i said, this one is in excellent condition and has never been ridden in anger. If i was concerned in ANY way about the quality or condition or the frame I wouldn't put him up for sale. Thanks for the interset, and I'm open to offers.