Join Date: Nov 2000
Location: Canton GA/Poway CA
FWIW, for all the years I ran the Camaro SS wheels on my Impala (now sold), the stock size tire (255/50-17) was the only tire I used--the wheels were an extra 1/2" wide, and they worked fine. I don't know if a 255/45 will suit you, if you're going for a certain look, but I'll guarantee the 275/40 will be "firmer" as far as your butt-o-meter.
The really interesting observation here is how the different tire manufacturers interpret the "math" when it comes to how tire sizing numbers translates to the actual product, when you can take the same size tire from 6 different sources and they all vary in dimensions, and often seem to ignore the calculated numbers. Some run narrow, some run wide, and actual tread on the ground can vary as much as 1/2" or more for the same specs.
You do have choices.