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@Linc
You're going to think i'm fully mad now. But, in the not too distant future, it's a distinct possibility that you could produce a mould and run off concrete bike frames at a rate of knots using UHPFRC (ultra high performance fibre reinforced concrete). It certainly looks like it has the possibility of outperforming a wood frame if you could cast it thin enuough, although i've only ever seen it used for bridges and roofs and it's still very specialist stuff.