I'm looking into possible buying a used trek 5000, year '04. Im wondering if anyone knows the quality of carbon fiber in this model. From rowing I have seen very old shells that are practicaly brand new because of the quality of work put into the carbon however I have also seen a 2 yr old boat that has lost all stiffness and shows visible flex. This of course gives me some concern since I am not very knowlegeable about wear and tear on carbon bikes.