I purchased HP Racing HP5 rims with 18x8 for the front and 18x9 for the rear. When it came to tires I went with the OEM F355 225/40/18 for the front. This tire size is perfect for the 8" rim. For the rear, I went with 255/40/18. I could not find 10" wide rims with in budget and had to settle with 9". For this reason, I chose a smaller rear tire compared to a stock F355. I did not think that 10cm was going to make a big difference. Hind sight being what it is, I should have gone wider instead of narrower. Wider rear tires always look better. I did go with a rear tire with the closest tire height to the F355. In the tables below you will see that the front tire height is lower than the rear and I wanted to continue that look.
Wheels:
Front Wheels:
| 18x8 | Width | Ratio | Rim | Tire Height |
Diameter | Diameter difference from Fiero |
Weight in lbs |
| Stock F355 | 225 | 40 | 18 | 3.5in | 25.1in | 1.63% | |
| Wheels Purchased | 225 | 40 | 18 | 3.5 | 25.1 | 1.63% | 46 |
| Stock Fiero | 205 | 60 | 15 | 4.8 | 24.7 | 0 | 43 |
Rear Wheels:
| 18x9 | Width | Ratio | Rim | Tire Height | Diameter | Diameter difference from Fiero |
Weight in lbs |
Speedometer error |
| Stock F355 | 265 | 40 | 18 | 4.2in | 26.3in | 4.73% | N/A | |
| Wheels Purchased | 255 | 40 | 18 | 4.0 | 26.0 | 3.50% | 51 | 2.53% |
| Stock Fiero | 215 | 60 | 15 | 5.1 | 25.2 | 0 | 43 | 0 |
| HP Racing HP5 front rim | OEM front rim |
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| HP Racing HP5 rear rim | OEM rear rim |
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HP HP5 Rim Specs:
f 18x8 38mm 22lbs (24mm wider towards the fender, 26mm wider towards the shock tower)
r 18x9 38mm 24lbs (30mm wider towards the fender, 46mm wider towards the shock tower)