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@peter_v
@ jonny thanks, it's a 'vintage' C4 (carbon monococque pioneers, Italy) from 1997, 3 main tubes & fork are composite, rear triangle is aluminium. setup weighs 8kgs as pictured. More C4's here.
@ OJAW thanks, it's a 1971 Toei Bluebird, I don't know the design theory behind the triple triangle though