I was going to say the same thing about having the tires re-balanced. Ok another thing to keep in mind is that they are not a high speed tire and as speed is increased the overall tire is streching and becomes uneven, resulting in your vibration problem, at those speeds I have vibration but my tires are zero'd on my balancer which also happens to be a Hunter with road force feature, even with the road force they all stayed well below 15 LBS which is great for an aggessive tire. not a bad machine for 25,000$ AHAHAHA. also get your front end checked out also, sometimes vibration is not the result of tires but front end work needs to be done. By the way I work at a tire shop (Big O), so I can help out in those area's HAHA