Originally Posted by StanSeven

What's her objective - to go faster and further? If so, upgrdaing a hybrid bike doesn't do anything. Unless her current bike doesn't fit, switching to a new stem, fork, bar and seatpost doesn't do anything. Going to carbon has absolutely no imapct. Despite all the marketing hype, carbon doesn't do anything except cost more - the exception is CF frames.

If she wants to go faster, get a road bike

Originally Posted by fmullegun

No the point is to make her feel like she got an upgraded bike. The carbon is so it looks cool.

My question is which parts that I am changing for these reason are more likely to have more impact on actual performance.