Just got my CMS w/ the 18 inch wheels, Pirelli Cinturato P7 All Season Run Flat 225/45R18. The door jamb says 32 PSI all around...anybody mess with the tire pressure? I've search other posts and some are running 40PSI but I think it must be for different wheel/tire combo, +8 PSI seems pretty hire for regular driving over factory recommendation...

 

When I got my 2016 JCW Countryman, the tires were over inflated by about 7-8 psi. I changed it to the recommended air and now it rides harder. After my new suspension goes in on Tuesday, I will return the pressure to delivery (about 37 all around).

BTW, I have the 19's and 225/40 Pirelli Run Flats.

I would try both ways until you feel what you like.

Brett

 

Thanks...took a look at the manual, looks like 32psi is indeed the recommendation for under 100mph. Over 100mph it's 38psi. Guess I'll play around using those are targets