[427sharpe]

Any wobble between 60-70 mph that dissapates above or below is tire balance! Make sure that the guy balancing your tires is competent, and that the machine he is using is calabrated...yes, they do have to be 'trued' every now and then! Also, if you are static balancing, which means using weights on the inside of the rim to avoid putting a weight on the external edge, you will have a lot harder time getting a good balance. Another help is to mark the tire and rim ass'y with a ink crayon (like a junkyard uses) on the inside to make sure the tire is not 'walking' around the rim during hard acceleration / braking...not that you'd do that in a Cobra! If you want the best balance but not the ugly weight on the outside of your pretty rims, have the technician do a dynamic balance. He will put one weight on the inside edge of the rim, and another (usually stick-on) weight as close to the outside edge as possible. this will be the most accurate, as long as the machine is in tolerance and the operator knows his a$$ from a hole in the ground.