Join Date: Apr 2000
Location: Livonia, MI (Detroit) USA
Start with one variable of the formula at a time, not both...
x = wheel width and offset
y = spindle
Choice#1:Set a wheel/tire you wish to use on there and test-fit. From there you can tell what offset you will need.
(If you still have the 4-lug on there, possibly remove all the studs to be able to set a 5-lug wheel/tire on a 4-bolt spindle. )
Choice #2: Put a spindle on there, and maximize the wheel/tire you can fit.
I did choice #1 on my Zephyr, and had a hard time finding wheels.
I did choice #2 on my Mustang, and pushed fenders out to fit.
You can do it with graph paper, and draw offsets and wheel/tire profiles to scale, and put them in wheelwell... Been there, done that. Its an agonizing decision before you blow $$$ on wheels/tires. Measure twice, then order parts.
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1989 Mustang S-trim Roadracer