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I am a new cyclist who is on my 2nd year of biking. I bought a cheapo Schwinn MTB at Walmart to start with but now I want a real road bike. I currently have $2k saved up and am looking into a Specialized Secteur Exprt Disc which is aluminum. I did pick up a carbon frame bike at the shop and although it is lighter, not by much. How sturdy are these carbon frames? From what I've read they can crack if you get in a tumble, and at that point you are done. Vs an aluminum frame will more likely than not be OK. I'd have to spend over $1000 more to get a carbon frame and as good components (Shimano 105 or above) so I don't know if its worth it or not. I'm just a casual cyclist who likes to go on long solo rides for fitness/fun.