You can't use it for bearings and there are better materials for other parts. The pros are riding bikes that are about 15 lbs that is pretty light.

Like others said regarding carbon not being suitable for every job. Carbon is also expensive and in many cases a comparable aluminum or titanium part is just as light and more durable.

You need different material characteristics for different components. In ball bearings for instance you need very hard and smooth surfaces, something which carbon fiber and related laminates don't manage that well. It's like with clothes. Cotton might make a nice t-shirt, but won't do well as a sole for your shoe.

Thanks!!

But why not use carbon fiber for every single part on the bike?

==people smarter than you, use the right stuff for the job

wle

Carbon fiber can only be used in certain parts of the bike, because carbon fiber is not structurally sound in certain shapes, and angles. Car manufacturers have had problems with this for years. That is why they are making to move to Carbon Kevlar, it is still sound at very sharp angles, and even curves.

pretty silly with carbon fiber tires or saddle cushions

plus fibers are good for long thin things, not so good for compact things like nuts and screws