I bought 4 new tires and 4 new rims "aftermarket" in April of 2010 had a LITTLE vibration so i took it to walmart "where i got the tires" bought the lifetime balance rotation with them and had them balanced and rotated while i was shopping. Went to pick it up and they said ALL FOUR rims are bent.......i said uhhh ok blew them off left and got on the interstate and it was shaking pretty good so i called them and long story short they said all they could do is try it again. I guess what I'm asking is what could have happened?? The only thing i can think of is they balanced them with the eccentrics still on the wheels....