I run a 255/45/18 front on 8.5" wheel, and a 285/45/18 rear on a 10" wheel. The spring rates wont make any difference regarding the ride height. You can set that with the coil-overs. I dont run a coil-over in the rear yet, just standard springs that are about 1" lower than stock. There are some pictures of the car on my profile. I never ran the springs too low, so there was more room to lower it if I wanted to.
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1973 Pontiac Grand Am ERL built 430 CI LS7, Brodix STS BR7 heads, Magnum T-56 6-speed, Modulare 19" wheels, QA1/Global West/Speedtech suspension, Wilwood 6/4 piston brakes. BMW Donnington Gray paint. All wrapped up in a Hurst Pontiac tribute theme.
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