Could someone with the STR staggered tire sizes (front: 245/40ZR18; rear: 275/35ZR18) take a look at the spec sticker in the driver's door jamb, and let me know what front/rear tire pressures are specified?

I'm converting my non-STR 4.2 to the staggered setup and would like to know if the pressures are different from my current F/R 35psi/35psi.

Thanks!

 

Rears are 40psi

 

Depends on tires. Yokohama will differ from Bridgestone, Michelin, Falken, Kumho, etc... One brand may need to be at 40psi another brand may be over inflated at 40psi... See what I'm saying? Here's an example: 2012 Lexus IS350 with Michelin tires, 35psi. Same car with Yokohama, 32psi. You basically gotta see how they are wearing. If they are over inflated the centers will wear faster. Under inflated the inside and outside edge wear faster. Again all tires differ

 

For speeds below 100 mph, it recommends 28 front, 32 rear. For over 100 mph, it recommends 36 front, 38 rear. Oh, and the sticker is in the passenger door jamb on my car .

 

Your 2003 pressure specs seem to be quite different than the 2006 specs (40 rear) that Injekter quoted earlier in this thread. Maybe they changed the OEM tire supplier? Also changed the door jamb for the sticker? Hmmm. I guess of more significance is the delta-P from front to rear.

 

Just looking for Jaguar's OEM specs. Been driving for 53 years, so seen a lot of tire wear...

 

OEM was Continental ContiSport Contact.

 

just checked im 40 psi front and rear.... doesnt say if i should hop out and deflate if im attempting 100mpr..........i dont think we are looking for race prep info here ( over 100 ?) just general INFO

 

Thanks for the added details. Looks like Jaguar specified more than one set of tire pressure specs for the STR over the production run (product refinement?). My 2008 4.2 non-R specifies 35 front and rear. Your 2006 STR specifies 40 front and rear. So I guess when I go to the staggered STR set-up, I'll just play around within that range, at least initially.