So i have been in pursuit of the perfect rims for about a year. I want a set of kyowa racing 18x8. Offset 35mm. For an 87 gt. I have been through all the calculators the diagrams blah blah. I want 215 40/r18 in front and 225 40/r18 in back. Im lowered on springs 1"and will go lower once the rims are on the car to get a good stance. Im i being too picky with the 215's in front, will 225's rub or stick out. I just dont want them hanging out there, i know its only like a .25" on each side of the tire thing, but i dont want one of those skateboard cars where the rims hang out.

I had some 18x7s with 235 40 in the rear and 225 35 front with a 37mm offset, no poking or rubbing on stock height. The front rubbing might be your issue if you have too much sidewall so I would say nothing bigger than a 245 in the rear or 225 40 in the front with that offset

I have 18x7.5 (+38mm) on front with 225/40/18 and rear is 18x8.75(+35mm) with 265/35/18

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87GTseries 1 3800sc (7.597 @88.53 1.579 60ft)
(series II swap in progress)
85GT Northstar/ 4t80e
86GT 3800 n/a---sold
Northstar Rebuild

10mm section width is pretty small. Are you sure it's worth giving up the ability to rotate the tires for a difference that's trivially small?

quote Originally posted by KurtAKX: 10mm section width is pretty small. Are you sure it's worth giving up the ability to rotate the tires for a difference that's trivially small?

You are right about that.
10mm = .394" Remember .375" = 3/8"
10mm / 25.4mm/in = .3937in.

On the other hand, staggered tire sizes can help to improve a Fiero's handling. Ideally, you want the tire widths, front-back, to match the Fiero's front-rear weight distribution, roughly 44% / 56%.

~ Bob ~