Who's making the move to STU?

Zewerr

I think you might be in the sweet spot with the +22. I got hold of the fitment tool and set it to +25 and it appears the tire would be rubbing against the spindle just a little. +22 seems to give it a mm or two of clearance. The tool still probably isn't perfect, but it seems to give me a good idea. Now, should I take the plunge and pull the trigger on some wheels, trusting my results?

ConekillerZ34

Go for it! I thought the same thing based on measurements. My calculations suggested +24 would work, but with some uncertainty on the widest part of the tire -- so I figured if I'm going to potentially need spacers either way, I started at 22. I also have the Nismo flares so that helps (though only visually) with any poke.

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2016 Nismo 370Z | SCCA STU Autocross Build WIP
2015 GT-R Black Edition | Sold
2006 350Z SCCA STU prepped | Sold