I purchased a Pilot 2.1 two years ago after riding a hybrid for about 10 years. It has an aluminum frame and a carbon fork and seat post. I thought this bike was a comfortable ride and a good transistion from my hybrid. I figure if it wears out, it's time to buy a new one - good thing too as cool new bikes are coming out all the time. I really liked the Pilot that was all carbon but couldn't afford it. I think Trek warrantees their carbon frames for life but you should verify this with your LBS. Good luck on your decision.