Jim, I run 33 lbs. all the way around. After buying 2 sets of 275/40/ZR18 Michelin Pilot Sports for the rear, at $319.00 each tire, due to wear in the center of the tread, I asked around and learned that with the wider tires such high pressure was unnecessary. Now I run 33 lbs. all around and 40 - 41 at the track with no further accelerated wear.