There is a lot more than balance to fix shakes in tires. Technology has come a long way in tire balancing and rim/tire run out matching. Here is a video from Hunter engineering demonstrating their Road Force Balancer. Note ...this is old technology...we have been road forcing tires for over 10 years to fix non-balance tire shake. I road force all of my slicks and have to re-index most at least once due to their concentricity is not near what a OEM tire has and drag slicks undergo side wall damage from launching that can show up in a road force test but not be a balance issue.
Enjoy! Learn something new!
http://www.bing.com/videos/search?q=...9C2AC5FD52B319