I'm thinking of purchasing this frame from a guy down the street who used it for racing. The only things of concern for me are the rear trinagle and seat post that the owner modified himself. This was done to make room for othe gearing of 51x15 as well as the use of 23x700c wheels. Looking at the pics do you think that this has anyway compromised the frames integrity? What would it cost to fix this if need be? I appreciate all replies.