280z-Hab,what is the width of the rims?To run a 235 series tire in the rear,you will probably need to run at least 8-9 inch wide rim.I run 225-60-15 on 7.5 rims and have had some rubbing issues.I did bend the lip back under the rear wheel wells and this helped but every now and then I do get a slight rub,especially if I have a passenger with me.If you can find a 50 series tire,that would be mo better.Nice car.