I've always had a slight wheel shimmy on the mains of my RV-6. When I put new tires on it would be better for a while then get progressively worse. I finally installed the wood stiffeners and that helped. Lately it's been getting bad again. When I applied the brakes it would get real bad. I thought I warped the rotors. so today I finally pulled the wheel pants and removed the brakes. I jacked up the plane and spun the wheel so I could maybe see if it looked like the rotors were warped. I could not believe what I saw the tire was out of round by about a 1/2 inch. At first I thought it was because it was sitting on that spot and it made a flat spot, but no that wasn't even where it was sitting. These are Michelin Aviator tires. They were not abused in any way. They are one year old. I thought I was doing good by buying Michelin tires. The tires are not even halfway worn. I guess I have to change them, what is the consensus about tires. Which ones should I get. Anyone have any ideas about what tires might stay round! I can?t believe I?ve had this problem in my truck with crappy tires, not staying round. Now I?ve got egg shaped tires on the plane. I was about to get new rotors and maybe new wheels because I was so fed up with the shimmy.