I assume you are looking at TireRack. You can always step into 285/35/19, it's a good fit to your 10 in rear rims, arguably better than 275.

Yea I'm sure they fit and I know the z can still spin a 285 my concern is how close the tire is for speedo reading, miles and also the stability control programming. I know when I worked for GM I could select tire/wheel sizes for the EBCM but I'm not sure how critical it is for Nissan. Wish I still knew a Nissan tech to see if the sport and Nismo run the same or different programming for the stability.

1010tires.com has a calculator that can give you the percentage change in wheel speed. the nismo uses 285/35/19 stock in the USA so I dont think it will be an issue.

For reference, i run a 275/35/18 on my rear axle and the speedo reads anywhere from 3-5mph faster than actual. Stability control is still functional with my setup (though it's never used on the track)

Going from a 275/35/19 tire to a 285/35/19 tire means that your speedometer is off by 0.67 mph at 65 mph. So essentially negligible :twocents:

Yea I did the calc last night and looks like just over a half in in dia, so only .25 radius. Looks like re-11 may become an option after all.

The only issue with pss is everyone is out of stock with no expected availability date. If you need new tires soon, it's easier to find other brands in stock