[RenoE92M3]

Originally Posted by slicer

Tire performance is not solely driven by stuffing the widest tire possible onto your car. It's best to match the tire sizing with the rim width.

Here are some links:

http://www.yokohamatire.com/tires_10...m_wheel_width/
http://www.tirerack.com/tires/tirete...jsp?techid=233
http://www.tirerack.com/tires/tirete...jsp?techid=198

Every tire has a recommended rim width range. You can go outside of the recommended range but performance is compromised. See link below. The recommended rim width for your 305/30's is 10.5" - 11" and for the 275/30's it is 9"-10". Your 275's fall within the range but, based on my experience, they perform better on a wider rim and the section width will be increased. 9.5" happens to fall right in the center of the width range.

Click on specs tab
http://www.tirerack.com/tires/tires....=Potenza+RE-11

Note that the taller profile 275/35/19 that I recommended for the rear has a recommended rim width range of 9"-11" and 10" happens to fall right in the center of the width range. 255/35/19 has a recommended width range of 8.5-11.

Click on specs tab
http://www.tirerack.com/tires/tires....ot+Super+Sport

Do you see any tire roll happening in the photo? The sidewall is perfect Next week I will get you a photo. If I wanted 315s I dont think it would be much of a problem.