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That is nothing compared to the Nicola Barra (1941), he was the master when it come to aluminium construction, the majority of his randonneur bicycles were under 10kg, and that included the tyres, bottled dynamo, mudguard and rack.
They were named Barralumin;
Interesting: if they could do that pre-war I wonder why there wasn't a boom post-war, what with so many more skilled metalworkers familiar with aluminium.