You need to find a shop with a road force balancer, this is the only way to go. Most shops won't have this machine due to the high cost, but some dealerships should. Road force machine will tell you if the tire is bad, rim etc. Very high tech machine, of course I work at ford and we don't have the machine yet!;c Our boss tells us to take them across the lot to the mercury shop cause they have the road force! That is your best bet to get rid of vibration, good luck!
03 Silver/Black Harley (stock)
95 Mustang Cobra (475 rwhp going lean)