My car rides like absolute garbage right now, it really started after I put the rims on, I'm not sure if its the rims or the tires I have that are causing it. The ride is just really harsh and my car tends to jerk around, for example I will just be driving in a straight line then it will just try and jerk me to the right/left all of a sudden, this happens more often when I am changing lanes, it tends to do it quite a bit then. Anybody know what could be causing this problem, like I said it started happening after I got my rims on. The tires are not in the greatest condition but I would guess have about 30% tread life left. They are Kumho Ecsta MX. Also thinking about trading my solid axle and suspension stuff for an IRS will that make the ride better?