I am looking into getting a new road bike and and I have a question about frame longevity. I currently have an old Trek 330 from when I was in highschool. This bike is very reliable and people always tell me that it is in incredible shape for a bike that was purchased in 1987. Since it is a steel frame and has lasted this long I am leaning toward a steel frame over a carbon or Al/carbon frame for durability. My budget at this point could also let me purchase an all carbon frame. It just seems to me that if you are joining two different materials together eventualy they will develope cracks at the joints or have other problems. I have also heard that carbon will eventualy start to crack. Any input on this would be great.