tire shop or with rod while spinning off ground. It happened to me and I just rotated slightly bent rim to back and problem is gone (for now, I cant rotate tires until I replace rim)r My 2 cents Chris My 540iA steering vibrates when travelling at about 60mph. It feels exactly like wheel imbalance and clears at higher (or lower) speeds. I've had all four wheels balanced (I watched it being done the second time - just to make sure!) but this hasn't made any difference. Any ideas?