Tire size programming, Please Help!

[007X3]

Here is a copy of my post from bimmerfest.

Didn't really get a chance to take some meaningful pics of the Pirelli P-Zero Nero MS because of the recent weather but here are some pics in the meantime.

I got some comparison shots for you of the Michelin Pilot Sport AS and Pirelli P-Zero Nero MS.
Pirelli P-Zero Nero MS is in the pictures with snow. Look at the width of the rear tire This is what the Sport Pac X3 should have looked like from the factory.

Look at this picture. Can you tell which one is 255/45 18 and which one is 235/50 18. The only visible difference is wider shoulder blocks on the 255 tire which is on the right. This is my main gripe with Michelin Pilot Sport AS. As you can see from the below pictures the Tire is actually stretching outward to fit on the 18x9 rear rim.