Unless you're seriously going to do some sort of competition work, and have sponsors with deep pockets, carbon is just B/S.
Don't waste your money my friend. Carbon is the new, well not so new, 'thing'........carbon this, and carbon that..........everyone has carbon doo-dahs.
Forget it.
It won't make you go any faster, it won't even make you FEEL like you're going faster. It will only make someone you don't know a little richer !
