Just put on some new c5 rims and wheels 17x8.5 on all four corners, they were supposed to come already balanced. But when I get up to about 60mph the cars starts to vibrate the faster I go the more it vibrates. Is it the balancing or just bad tires or something??

hm.....not sure, but i was driving and my caliper came off! knocked the wieghts off my divers side front rim...i have to get them balacned now, when im braking the car decided to jerk to one side

need balancing badly

and stik00 who messed with your calipers last
they probably fawked it up