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So we're looking at properties around between 1/20th-1/18th of 4130 cromoly, but a density quite a lot lower.
My biggest concern is that in order to get enough material to mimic the the properties of steel, you'd basically be riding a big solid block of frozen sausages with a headset and and presfit BB :D
MisterMikkel
frankenbike
Young's modulus: call it 11 GPa
Yield strength: 25 MPa
Assume a density about the same as water.