Well, it would seem that the serial number being ground down would possibly confirm the idea of a sketchy past, either way, I got an amazing deal for CAAD10, ****, I didn't even know what I was buying, just that it was Cannondale and extremely light weight, Only problem with it is that there is several layers of paint on it, fortunately for the most part it is coming off, but the paint is being rather stubborn. I will start my build thread now.