In the near future I hope to be getting a Trek 5200 (my dream bike )I know carbon fibre is a very strong and light material, but it seems fairly fragile. What types of stresses are these frames able to withstand and which will cause the frame to fail catosrophically? I feel much more comfortable having a minor reck on a "metal" frame than on a composite. What if the bike falls over when its against the wall, will it crack or anything like that? I just want to be 100% sure of the integrity of the frame before I blow, I mean "invest" a few grand on a bike. Thanks !