Hi, i just purchased a set of 245-40-18 for my 540 with new m5 wheels. They seem to be a great all-around sport tire for dry and wet conditions. I do drive from the bay area to oregon, so changing road conditions are my tire selection requirement. The ride is smoother than most z rated tires, performance is not noticiable unless to hang it to the extreme. But is still no real slip angle from the tire patch. Anway, I hope this helps.