GTA now in
Join Date: Sep 2015
Do you mean it wobbled a bit before the tyres were changed but now wobbles a lot? If so the tyres are either out of balance or poorly fitted.
If it's not the tyres / wheels, try jacking up each wheel in turn so it's just clear of the ground. Spin it round to see if any of them run out of true, then try gripping the wheel top and bottom and wobble it to check for wheel bearing wear, then either side to see if any suspension wear shows up.