Brakes Wheels 2nd Gen Tires Most liked posts in thread: Tire Pressures

Anywhere from 33-40 psi is good. Lower is more comfortable, higher is better fuel economy. 36 is a good compromise.

 

I have the exact same car and for street driving I follow the recommended pressure of 38psi and get pretty even wear

 

I believe the air pressure specified on the door is for the original run-flat tires.
Since you have changed to non-original equipment tires, you will need to select your own air pressure. I usually run 2 psi less in the rear compared to the front. I am currently using 38/36 for the street with 215/40 tires. Your 42/40 is probably OK with 45 series tires since your have more sidewall for ride comfort. If your ride is a little to stiff you can lower the pressure a couple psi. The trade-off is the higher pressure will provide better fuel economy.

 

Michelin 215/45/17's here

I have found thet 35psi all around seems to work well on my 2009 JCW with sport suspension.

Michelin Exalta PE2's and I just rotated them same side at 5,000 miles with no sign of uneven wear at all.

I called Michelin and they said anything from 33psi to 38psi would be a good choice to use. Under 33psi would probably cause under inflation problems.

35psi is what I'll stick with. Good ride and handling and no tire noise at all.

 

Since you are running a non-run flat 205 wide don't go over 38psi unless its to autocross.

 

I have Star Specs on and run them at 32psi. When they were first put on the shop put them at 40 :eek6: Waaaaay too much for my taste.

 

Same here running 32 with nitrogen.

 

I run 35F 34R on my Continental Extremecontact DW's - 215/45/17 - works very well car - Dragon tested and approved.