This video is already a few years old, but still cool.
Point of order, I do have carbon fiber bikes personally, and I have a few frames available for sale. I am not 100% sold on carbon fiber as a frame material. Why? Because of catastrophic failure of carbon tubes. It’s not pretty. The bike become instantly unsafe to ride. It’s difficult to repair properly. The frames themselves once they’re toast, are not recyclable as of now, breaking down the epoxy to extract the carbon is cost ineffective right now. That may change in the future, but right now not worth the time.
That all said, carbon fiber is an amazing material. You can do so much with it.
Aluminum is making a comeback right now. That’s good. It’s biggest drawback is once an Al tube is damaged, it’s not reparable. Reheating the tube to replace it messes with the crystalline matrix of the Al alloy, making it very, very brittle.
Steel and Titanium, both can be fixed if damaged. The Ti frame requires some specialized knowledge of welding it. Steel, anyone who can braze copper pipes can essentially repair a damaged steel frame, so your friendly neighborhood plumber could make your bike rideable again.
Back to why I’m posting this. The video from GCN (Global Cycling Network) did a bit of work on a graphene impregnated carbon fiber frame. It has the possibility of being a better version of the current carbon fiber technology, also a bunch more expensive. Watch the video. I found it interesting, I hope you do too.