Isn't there a rule that if you make the tire wider you should alter the height-ratio as well?
So that if you are going from 215 to 225, your height should go from 40 to a 35 series.
Yes, but there is a formula, and you don't drop it until after a certain point.
Example
215-40-17 = approx 603.8mm tall (Standard NSX height)
225-40-17 = approx 611.8mm tall (8mm taller)
235-40-17 = approx 619.8mm tall (16mm taller)
225-45-17 = approx 634.3mm tall (30.5mm taller)
225-35-17 = approx 589.3mm tall (14.5mm shorter)
235-35-17 = approx 596.3mm tall (7.5mm shorter)
In some cases, tires are NOT avail as in 235-35-17
So 235-40-17 is the only option
I try to stay within 15mm of stock, with a max of 20mm Older NSX's tires are a tad shorter in height than the 02. Also if you change your front height, you need to change your rear height accordingly or you will have TCS issues. (many threads on this, do a search)
I am always here to answer as many NSX wheel/tire questions. I try to catch the threads, but if you need additional help, email me. (I don't check PM's as often)
Tom