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I have to admit that I'm not massively knowledgeable on pre war bikes metallurgy, and was just making a sweeping Internet assertion. If I had to bet, I'd say that the amount of material they'd have used, as well as the glue, would have brought it to a pretty similar weight. Let's find a pair, I've got a fiver on steel. Everyone should really use steel bikes I think. And buy from local firms.... ;)
Are you saying an adequately strong aluminium bike, built with what was available in the Fifties would have weighed a similar amount to steel?