Arlo Cully made the chassis H.O.D full rigid. And the reason I said it didn't hurt et was due to I ran same mph same and same time.. That's all that was ment.. I understand the rotation mass.. I lightened my rear tires by 4lbs combined didn't seem to help much if any.. (Wasn't being smart wasn't arguing.. I'm not going to ask a question if I know the answer. I'm not stupid I understand the weight I'm pretty much saying is it didn't seem to effect it accordingly to the time slip