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Cadillac ATS General Discussion Forum Discussion, What's up withe the tires on this car? in Cadillac ATS Discussion Forums; Falling off topic?...
  1. #16
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    Re: What's up withe the tires on this car?

    Falling off topic?

  2. #17
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    I'm currently running 35 front 38 in the rear, but I'm looking to increase the front pressure to run Square all around


    Problem is, even at 35 front, things can get a little jiggly over rough roads. Plus I'm at about 10,000 miles, which means the tires are beginning to harden and are less compliant.

  3. #18
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    Re: What's up withe the tires on this car?

    Although both my BMWs recommended 32/35, I have been running them at 35 square without any problems. Tires last longer and the ride is well controlled and precise. So, being used to this kind of ride, I have also been running the ATS at the same pressures without problems. Yeah, it might be riding a little stiffer than at the recommended pressures, but I feel there are two benefits that override the occasional jitteriness: 1) More precise handling, 2) Better tire wear.

    BTW, on my 325, the right rear tire wore out faster than the other tires. Guys at Tires Choice told me the reason was that with my rear wheel drive, the initial power/traction is directed to that wheel and thus it gets more use???

  4. #19
    SLA
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    Re: What's up withe the tires on this car?

    Quote Originally Posted by flycaster View Post
    BTW, on my 325, the right rear tire wore out faster than the other tires. Guys at Tires Choice told me the reason was that with my rear wheel drive, the initial power/traction is directed to that wheel and thus it gets more use???
    325i has an open rear diff, which is what I'm assuming you have. Power is not distributed specifically to that wheel by design. The tire guys are talking out of their asses if that's exactly what they said.

    If by some coincidence you kept accelerating hard and the rear passenger side tire was always spinning, then yes it could happen faster. But first I'd make sure everything else in the alignment was ok, the tire was inflated properly, and there were no structural issues with the tire.

  5. #20
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    Re: What's up withe the tires on this car?

    Quote Originally Posted by SLA View Post
    325i has an open rear diff, which is what I'm assuming you have. Power is not distributed specifically to that wheel by design. The tire guys are talking out of their asses if that's exactly what they said.

    If by some coincidence you kept accelerating hard and the rear passenger side tire was always spinning, then yes it could happen faster. But first I'd make sure everything else in the alignment was ok, the tire was inflated properly, and there were no structural issues with the tire.
    there may be some truth to this the Current CTS-V is purposefully designed asymmetrically at the axles in order to eliminate wheel hop, this design must have some minimal effect on tire wear symmetry see link below:

    First Ride: Burning rubber in the 2009 Cadillac CTS-V

  6. #21
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    Re: What's up withe the tires on this car?

    Does anyone here know what the stock wheels offsets are for the 19" OEM wheels are? Thx

  7. #22
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    Re: What's up withe the tires on this car?

    It might be to soon, I have not seen any on a car yet. The 2014's on our lot are all plated chrome 18.

  8. #23
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    Re: What's up withe the tires on this car?

    Quote Originally Posted by M5eater View Post
    Higher inflation is used to reduce sidewall deflection on the tires powering the car= better handling characteristics and more contact patch on the roadway.

    Because you have a Premium AWD, I'm fairly certain you have the wider profile rims on standard 235 tires all around, so it might look a bit stretched(or not, just a guess).

    IE, Premium FE3 trim RWD ats's have staggered tire sizes of 235 front/255 rear.

    You still have the pressure differences because this is a largely RWD biased AWD system.
    The premium RWD has 225/40-18 in the front and 255/35-18 in the rear. The AWD models (prem, perf, lux) have all around 225/40-18. All other variants have all around 225/45-17.

  9. #24
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    Re: What's up withe the tires on this car?

    Quote Originally Posted by Cisitalia View Post
    The premium RWD has 225/40-18 in the front and 255/35-18 in the rear. The AWD models (prem, perf, lux) have all around 225/40-18. All other variants have all around 225/45-17.
    There are some optional 19's on the 2014 models.

  10. #25
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    Re: What's up withe the tires on this car?

    Changing tire pressure is not really a good way to "tune" the handling of a car, particularly for normal street driving. There is really only one proper tire pressure for street driving under 100 mph and that is primarily determined by the load (weight) on the tire. Too much pressure makes the tread bulge out in the middle, the contact patch gets smaller and you wear out the center of the tire. Too little pressure doesn't support the tread enough and the weight of the car rides on the edges of the tire, wearing that part out. You do get a bigger contact patch though, which is why off-roaders "air down" their tires when they leave the highway. If you are carrying a full load of passengers and baggage, you need to add air pressure because the weight the tire must support has increased. That is why the tire pressure placard on the door has multiple pressures listed. Too little pressure for a given load on the tire can cause it to dangerously overheat as well due to over-flexing of the carcass. Having the proper air pressure for a given load means the tread evenly supports the weight of the car across the whole width of the tire, giving you an optimum contact patch.

    The sharpness of the handling, as affected by the tires, is primarily determined by the sidewall stiffness that's built into the carcass of the tire. "Sport" tires have stiff sidewalls and quick handling, even jittery, "touring" tires have soft sidewalls for a good ride but "mushy" handling.

  11. #26
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    Re: What's up withe the tires on this car?

    Thanks for the input.

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