Nobody here has mentioned the climate impact of choosing carbon fiber over steel.

Starling Cycles, a rare producer of steel mountain bikes, concluded that a typical carbon frame uses 16 times more energy than a steel frame.

https://solar.lowtechmagazine.com/2023/02/can-we-make-bicycles-sustainable-again/

Of course, any bicycle will be more sustainable than a car. But we’re in a climate crisis, and that means taking extreme measures, including considering whether even low-impact tools like bicycles could be even more sustainable. We can’t afford to be completely uncritical of any technology.