I have the same problem right now on my 2007 Toyota Aurion Sportivo SX6. I had stocks on my Aurion previously and got sick of them soo decided to get a set of 20's. Everything was fine upon fitting my 20's, tested them out and seemed fine. Although i did notice a very slight shaking through the wheel between 90 - 100km which i didn't have with my stocks. My Aurion was also pulling to the left a fair bit, but i had that same problem with my stocks. So i decided that it was time to get all four wheels balanced and aligned, i called around and at the time Kmart Tyre and Auto was the cheapest so i decided to go with them. Had the wheels balanced and aligned and picked my Aurion up 2 hours later. Was driving my Aurion home and everything felt good...i have a pretty decent Focal Sound System soo had the music blasting on the way home. Had the kids in the car the next day soo i had my subs turned off and music down when i noticed coming from my front right wheel, there was a ticking sound. Anyway to cut an extremely long story short i took her back to Kmart Tyre and Auto and they continued to tell me it was because of the stones in my tread. Had them take all the stones out, drove my Aurion home and still making ticking. Called em up and they said oh yeah it's probably just stones as i have a gravel drive way. Was on my way home from work when i heard the ticking louder than ever and then something shot off my wheel and came under the chassis of my car, after this my steering started to shake at 90-100km again. Had a look when i got home and was missing a wheel weight. Called Kmart Tyre and Auto and they said bring your car in and we will re-balance the wheels. They did that, i got my car back and now i have an extremely bad shaking between 100-110km which i never had before taking her to Kmart Tyre and Auto **** GREAT! Am taking my Aurion back to them tomorrow and if they can't fix the problem than car is going to BOB JANE T MART who is actually cheaper by $20.00!