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gbj_tester
Might look like that, but in order to get proper aero-profile steel tubing Rob had to use tubes with much thicker walls than you normally would use on a bike. Steel bike tubes are generally between 0.35mm and 0.6mm in the middle sections (thicker at the ends, obviously, on double-butted tubing) but the walls on that one are much thicker. I suspect they're 16g, or 1.6mm. The downside is it's heavy. The upside is it's still reasonably strong despite the small tube sizes. And I suspect it's not all that stiff. At all. Wibbly wobbly in fact.
Still not porn though.