I got a fence made out of bike frames. I should take one and cut off the lugs and epoxy and screw wood or bamboo unto the cut off lugs to make a faux wood bike. I would not feel safe with a splinter cycle though. Bamboo with carbon fiber rods epoxied inside the bamboo would be my choice if using old cut off lugs.
This is a great idea!
Thick ratan would be strong enough and certain varieties of bamboo are solid core and strong like carbon fiber because the plant fibers run the entire length of the rod.
Check out martial arts supplier for bambo and ratan bo staffs.
I would imagine that certain kinds of hardwood with long grain would be plenty strong too.