I have a question. I always noticed that one of my MT ET streets gets flatter then the other, over the span of a few weeks it'll go flat. So I put a little theory together. I've heard that slicks with tubes lose air. I bought these slicks from a guy on ebay, already mounted. So maybe he was using the tube like Eibach uses the airbag in their springs? Maybe this is why sometime when I go to the track and I get better 60' times then the other? Of course it could be because of alot of things; weather, burnout, etc. But maybe the tires were suposed to be set up so the side with the tube is on the side that the car dips? Maybe....