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Thread: Tire Pressure

  1. #1
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    Tire Pressure

    Just wonder why engineering wants 35 Psi. in front but 40 psi.in rear tires.
    Any knolage on this?


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  3. #2
    blue_skies is offline Cadillac Owners Fanatic
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    Re: Tire Pressure

    Are you running the offset tires (wider tires & rim in rear, standard in front)? If so, the extra PSI may increase mileage, handling and cause more even tire wear.

    For standard front and rear, they all should be 35psi (cold).

  4. #3
    zr1mom's Avatar
    zr1mom is offline Cadillac Owners Fanatic
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    Re: Tire Pressure

    Mine has the same size tires but the sticker in the door sill says 35 front and 40 rear. Thought that was a little unusual.

  5. #4
    Mr.Blonde is offline Cadillac Owners Member
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    Re: Tire Pressure

    I was wondering this too. Same size rim and tire; the door, car's dash and onstar app all say 35 front 40 back.

  6. #5
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    Re: Tire Pressure

    The reason for this is to invoke some understeer handling characteristics, so the car will be safer for the average capable driver. Fairly typical for RWD cars.

  7. #6
    sqkid89 is offline Cadillac Owners Fanatic
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    Re: Tire Pressure

    my G8 came with the same recommendations, assumed it was somewhat standard for RWD cars as Cisitalia mentioned

  8. #7
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    Re: Tire Pressure

    I may try 37f and 37r and see how she behaves. That is what I did on my BMWs. On the race track, I always ran with 2 psi less in the rears to try and dial out some understeer and make the car more neutral.

  9. #8
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    Re: Tire Pressure

    My door sticker indicates 32 psi front and 35 psi rear. But I have the stagger setup 225/40-18 front and 255/35-18 rear, summer performance tires.

  10. #9
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    Re: Tire Pressure

    Well, I have AWD and believe the sticker is primary for RWD for summer staggered tires of FWD ......but I have the same 35 front 40 rear as well. I have same size all season run flat. Did they just put these on all the cars regardless of model and/or drive configuration?

  11. #10
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    Re: Tire Pressure

    I have AWD and have the same set up as you.

  12. #11
    muthaiga is offline Cadillac Owners Member
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    Re: Tire Pressure

    I have RWD, and the Onstar diagnostic report recommended 32 psi front, and 35 psi rear.

  13. #12
    gfxbt is offline Cadillac Owners Fanatic
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    2.0T RWD - recommends 32 and 35. I run 36 and 39. I think it feels a lot better with higher pressure. May have to adjust in the summer - when they get warm the rears get up to 43 (45 is max). I agree that the staggering is to dial out oversteer.

  14. #13
    Yplus is offline Cadillac Owners Fanatic
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    Re: Tire Pressure

    You should also take into account roll stiffness of the front vs. rear and weight distribution. Higher pressures will give you better grip for short periods of time but they will wear too fast in the center if you don't get the loading correct. I find trail braking with the car (when I can, given road conditions and the absence of other cars) and the recommended tire pressures to be pretty good actually.

  15. #14
    mikesul is offline Cadillac Owners Enthusiast
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    Re: Tire Pressure

    I find the higher pressures give a harsher ride. Not too worried about wear as wear rating on Mich tires is 500, pretty hard rubber. Thinking about getting a set of BFG gForce KDW2 in 235.35.18 to add a little stickiness. Dealer has nitrogen in my tires as delivered, anybody else?

  16. #15
    TX_ATS is offline Cadillac Owners Member
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    Re: Tire Pressure

    I also have the Michelin 18s with the 35/40 door sticker. I have noticed that i tend to get a "floaty" ride over 75mph on the highway. I already reduced cold psi to 33/38. I had initially thought the alignment was a bit off from the factory, but want to rule out tire pressure before having to take the car in.

    Any thoughts?

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