. I'm going with 215/35/18 up front.
! Meet us at the Carlsbad Outlet Center at 715 for the meet, then we'll roll to hre around 830 or so. 
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I recommend going with a 19x10 wheel. That way, you'll be able to use 275/30-19 on it, which will let you use a better tire (see below). 19x10.5 is too wide for 275/30-19.
That last part is not true. There is indeed one Max Performance Summer Tire available in 215/35-18 and 275/30-19: the Goodyear Eagle F1 Asymmetric. It won't show up if you enter both sizes together on the Tire Rack website, because the two sizes have two different speed ratings - W and Y, both of which are higher than the Z rating on the stock NSX tires, so the ratings aren't a problem. You just need to select each pair of tires and put it into your shopping cart separately when ordering from their website.
Angus do you have pics of those two different tires on a 10.5" rear wheel? That would help me see what the lower width and higher width would look like.
I hypothetically want to use a 275/35/19 on a 10.5" wide wheel for the rear. Now I know the speedo will be off bc of the higher aspect but I used these on my 9.5" rears before with Falken 452s and did not have any problems with TCS. The 35 series tire gives some more sidewall height so the tire doesn't look so skinny (like a 30 aspect) and I had a beautifully rounded shoulder profile w the 9.5"w. It also helped fill up my fender well bc the Type R suspension leaves the back end a tad high. But, I am worried that it may be too stretched with the extra 1" of width on a 10.5" wheel. Does the sidewall height get reduced with stretched tires? What's the consensus on the best tire size for a 10.5" with a safe offset, would 285/30/19 be better? The tire selection in that size becomes a problem though.
Here's a photo of the sidewall profile I liked (275/35//19), do the Falken 452s run wide or narrow? They didn't have a bead protector though.
275-35-19_NSX_tire_profile by Nero Tenebre, on Flickr
This^^^^^
The T1R is a really crappy tire. Its performance is even worse than most ultra high performance summer tires, and the UHP category is nothing great to begin with (a good choice for sporty economy cars, not for high-performance sports cars). It's also been around for a long, long time. Toyo has since come out with a replacement UHP tire called the T1 Sport, although they're still making the T1R.
Great looking fitment. What is the offset of those 19x9.5 (?) wheels?Angus do you have pics of those two different tires on a 10.5" rear wheel? That would help me see what the lower width and higher width would look like.
I hypothetically want to use a 275/35/19 on a 10.5" wide wheel for the rear. Now I know the speedo will be off bc of the higher aspect but I used these on my 9.5" rears before with Falken 452s and did not have any problems with TCS. The 35 series tire gives some more sidewall height so the tire doesn't look so skinny (like a 30 aspect) and I had a beautifully rounded shoulder profile w the 9.5"w. It also helped fill up my fender well bc the Type R suspension leaves the back end a tad high. But, I am worried that it may be too stretched with the extra 1" of width on a 10.5" wheel. Does the sidewall height get reduced with stretched tires? What's the consensus on the best tire size for a 10.5" with a safe offset, would 285/30/19 be better? The tire selection in that size becomes a problem though.
Here's a photo of the sidewall profile I liked (275/35//19), do the Falken 452s run wide or narrow? They didn't have a bead protector though.
275-35-19_NSX_tire_profile by Nero Tenebre, on Flickr
