New rear tires, loose steering, tire squirm

bthomas87

I just replaced my rear tires on my 16' sport with the new Firestone Indy 500 tires (which are actually re-branded bridgestone re-003). I didn't change sizes they're 275/35R19. The old rear tires were pretty worn out and didn't have much tread left, but the fronts still have tons of tread and look almost new, so I figured I'd just replace the rear tires only. Well now I'm experiencing loose steering/wandering, especially at highway speeds, and it just gets worse and worse the faster I go. I checked all the lug nuts and they're on tight, so that's not it.

The only two things I can think of is that maybe the car was lifted wrong? I bought the tires from tirerack and had walmart install them, and they used a scissor lift, which it looked fine on the lift, but idk. The other thing I found with some research is called "tire squirm" and people says it's just a new tire thing and they need to be broken in by driving them a few hundred miles.

Maybe you guys know something I don't. I'd like to hear some possible solutions. I just want to get back to enjoying my Z Thanks