Geeze 65lbs a piece??? That's a heavy *** tire! I don't know how much effect it will have on the performance, but there will some slow down in acceleration, and dropping of MPG's. The 33's I got from Pep Boys I have no idea what they weigh, but I could pick one up in each hand and load it, so not that much. They still had a slightly noticeable effect on performance and MPG's.