I guess it makes sense to stick with the OEM tires sizes since they actually put good sizes on this model. My 2006 350Z 6MT came with 225/45-18x8" (front) and 245/45-18X8.5" (rear) tires/rims/width. I upgraded that to forged (lighter) Rays CE28Ns 255/40-18x9.5" (front) and 275/40-18x10.5" (rear). This package was actually lighter overall because of the lightness of the rims and the Michelin tires AND this made the car work MUCH better on corner entry and exit. MORE grip but not so little pressure per square inch that it didn't grip either.
Have you tried other tires, Michelin PS2, Hankook, etc in the NISMO sizes?
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