Hrant,
The ideal situation is to get the tire overall diameter as close as possible to stock ones. 255/40/17 is slightly bigger, but small enough that you will not notice the difference. In fact the newer NSX comes standard with this size tires.
As far the recommended size for non-oem tires on oem wheels, the rule is always maintain the ratio of Rear/Front tires as close as possible to stock ratio. The TCS has certain tolerance, but I'm not sure how much.
Stock rear/front ratio is approximately:
oem 16/17 = 1.05
oem 15/16 = 1.08
TCS only kicks in if it detects rear tires spinning faster (slip) than front tires. Keeping this in mind, you can increase the ratio without ill effect. In fact, I like the increase ratio myself, this way the TCS doesn't kick soon enough and work great for track use.
From my experience using the oem 16/17 tires, I like using wither 205/45/16 or 215/40/16 in the front. With 255/40/17 in the rear.
I am ordering new tires with size of 215/45/16 and 245/45/17 Falken Azenis. I tested the tire in another car before and I can say this is the closest street tire to R compound tires available. The price is unbelievable too. They use to bring in 255/40/17 as well, but due to lack of sale, they stop bringing them in. Maybe if we can email them and request for them they decide to bring it back.
On another note, I think tire technology has come a long way since 1991. Yokohama A022 which come stock in the NSX is not superior anymore.
[This message has been edited by Andrie Hartanto (edited 28 May 2002).]
[This message has been edited by Andrie Hartanto (edited 28 May 2002).]
