I do 245/35 18x8.5 square just to throw more numbers out there for you.
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I do 245/35 18x8.5 square just to throw more numbers out there for you.
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i went 235 square and got rid of them within a month to replace with 255 square. the difference is unbelievable.
17x9 et30 255/40 square
As another interesting datapoint, I run 205/50's on my 330xi's with Michelin Premiers, and they handle great, too--firm in the turns and no tramlining whatsoever. Plus, they're that much lighter. Sounds like sacrilege, but I am hard-pressed not to prefer them. It just goes to show that losing a little tire width isn't the end of the world.
Of course, I don't race or even track...
I wanted slightly more grip, but mostly I wanted a larger thermal ballast + larger dissipation area. I was melting tires on the track left and right, but mostly because I ran some PSS and they are great street, but awful track tires. Funny how fine the line is. I run RE-71R 255 and the grip is pretty high.
I just thought 255 was the ideal balance of weight and width. Anything wider kind of turns into a "who's is bigger"contest with minimal performance gains