I recently had my front tires changed after a road trip, the whole way there and back my car rode along just fine, nice and smooth even above 80 mph. I bumped a curb while I was there, but that had no effect on anything, still drove smooth on the way back home. After having my tires changed though, my car vibrates on the highway when going 70 or more mph. Is it possible the new tires are out of balance? would an alignment help?