Saw something you all might be interested in at tire shop today. I was getting Nitrogen put in my new OZ/Kumhos, and I told tech to put 2.7 bar (39psi). He asked me if I drove fast and I said yes. He said that was too little pressure for 18" wheels and showed me Michelin's chart.<p><IMG SRC="http://img20.imageshack.us/img20/2121/1005157medium3ac.jpg" BORDER="0"><p>For the S60R, Michelin reccomends 2.5 bar (36 psi) for 235/45x17" and 2.9 bar (42 psi) for 235/40x18". Most people on here always say run 36 psi. I wonder if underinflation is why so many people with 18" rims get damage from potholes?