Berk frame was 631g no fork inc. It was an in house project with fixed seatmast and saddle. They reckon 500g is possible if you only use 100% premium grade carbon fibre.
I wonder what is possible if you make it for a skinny guy for pootling along.
As I weigh 79kg and should be 74kg [according to the NHS BMI calculator] it is all a bit academic for me [though itt could be much worse as I was 95kg at the start of the 1st lockdown.]
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