corvet786c

All I can say is wow, what a difference from going from a 285/40/18 when most of the time I was spinning to these Nitto 555R's 305/35/18.

I also noticed its going from a 27' tires to a 26.5' tire, Car seems faster, Is this correct?

Gas mileage also seems to have suffered more.

corvettebob1

Yes on both counts the shorter tire changes your overall gear ratio, it's like a slightly higher numeric ratio. I've had the same tires for the past several years and love them. Hope you matched the fronts with them as they are road race tires.

corvet786c

The fronts are General G-Max Tires 255/40/17

There seems to be more stability and a smoother ride, compared to the NT05R's I had

I also noticed my gas mileage went down.

Quickshift_C5

Those are drag radials, not road race tires. Same compound, different construction. These tires have a much softer sidewall, likely adding to the comfort.

the Nitto 555R-II are the road race tires, and they've been discontinued.

corvettebob1

My bad, I assumed he had the R2's those are the ones I have even if the R2's have been discontinued you may still be able to find some at Discount Tire.

Quickshift_C5

Definitely! I think they are still shown on their website. I used their RII tires for a few years until they were discontinued. At that point, I could get rears but the front were completely out of stock. Had to move over to Toyo R888's.