Metals question which is the best for a bike frame design?

Tim P

New member
In the design of a bike frame please help me identify appropriate material and explain your logic for the following
- performance
- environmental impact
- economic performance
some (but not restricted to) materials are carbon steel, alloy steel, aluminium alloys, magnesium alloys, titanium alloys, GFRP, CFRP, nylon, even wood.

Help me analyse each one and come up with what's most suitable for the above (performance, environmental impact and economic performance). Help me come up with the best material.

Regards,
Tim
 
I designed a recumbent bicycle for a SAE race last year and opted to use 4130 chromally .035-.049 wall thickness. This was mostly chosen based on a cost, weight, ease of use. Ideally i would use carbon fiber, but the cost shoots up. Aluminum i had dismiss right off the back, not because of cost, but i don't have a kiln large enough to heat treat.
If it means anything, my next project will be carbon with wood core. Normally i would be more than happy to do an engineering report/ cost analysis for you but i am obligated by contract not to.
 
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