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Cadillac STS Forum - 2005 through 2012 Discussion, wheel/tire fitment in Past Cadillac Vehicle Discussion; Deviation from OEM size isn't a big deal unless you can't compensate for the speedometer error. Perhaps Madtuner can adjust ...
  1. #16
    EChas3's Avatar
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    Re: wheel/tire fitment

    Deviation from OEM size isn't a big deal unless you can't compensate for the speedometer error. Perhaps Madtuner can adjust the VSS to correct that.

    Variance between front & back often leads to Stability Control System issues. (Side to side would be dangerous as well.) Each wheel has a speed sensor for ABS and Stabilty Control. AWD models don't use limited-slip differentials; they use open differentials and the Stabilty Control System to apply braking to the slipping wheel, just like F1 cars.

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    Re: wheel/tire fitment

    Sorry to thread jack, but does anyone know the width and offsets of the OEM 18" wheels?

  3. #18
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    Which. There were several different 18s.

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    is3_ftw is offline Cadillac Owners Member
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    Re: wheel/tire fitment

    edittededed

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    Re: wheel/tire fitment

    Quote Originally Posted by 1BadCadSTS View Post
    Which. There were several different 18s.
    Which wheel specs do you know?

  6. #21
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    Re: wheel/tire fitment

    High positive offset, widths in www.wheelcollision.com and in the Hollander Master Wheel Catalog.

  7. #22
    KRSTS is offline Cadillac Owners Enthusiast
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    Re: wheel/tire fitment

    Has anyone replaced the OEM 235-50-17 tires with 235-55-17? What are the likely handling tradeoffs? Any help will be appreciated.

  8. #23
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    Re: wheel/tire fitment

    Get into www.tirerack.com and call up the specs for your original tire - ?? the 235/50 ?? - and bounce the 235/55 against that fro secton, height, outside diameter, treadwidth, etc. . As long as you don't go more than about 0.3" over/under in OD and stay away from a large section width change you'll be OK ............... but large changes affect handling, transmission and speedo calibrations, and wheelwell scrubbing in turns.

  9. #24
    DBB
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    Quote Originally Posted by DBB View Post
    Okay I need some clarification. I want to put staggered 19''s on my 2005 STS v6. I've received advice for three different tire size combination.
    1. 245/35/19 front & 275/40/19 rear-from wheel guy

    2. 245/40/19 front & 275/35/19 rear- from discount tire direct live salesperson

    3. 255/40/19 front & 285/30/19 rear - discount tire direct website based on 2005 STS V6 specs

    Which set up of the above three will give me the best cosmetic look with less adverse affect on performance?

    Any advice would be greatly appreciated.

    Thanks,
    DBB
    Just a follow up: I got my wheels and tires installed this past weekend. I went with 245/40/19 front & 275/35/19 rear. I liked the result and looks of the front wheels and tires but at first glance the rear looked too short with the 35 profile. Too much rear wheel well exposed to for my tastes. Well I originally wanted a 40" profile for the rear so Discount Direct is shipping them to me. Can't wait to put them on.
    is3_ftw and is3_ftw like this.

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    Re: wheel/tire fitment

    255/45R18 don't rub in front but will wear the outside shoulders if not rotated.

  11. #26
    1BadCadSTS's Avatar
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    V runs 255/45/18 on fronts.

  12. #27
    DBB
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    Re: wheel/tire fitment

    Is it me or does the Discount Tire recommended 255/40/19 front and 255/35/19 and Tire rack recommended 235/40/19 front and 255/35/19 fittments make the front tires look significantly larger than the rear tires 40 profile vs. 35 profile. I think the 40 front and rear 40 rear profiles look better. Will I be jeopardizing anything by going with a 40 profile rear vs the 35? I see where there is enough room under the rear wheel to accommodate a 40 inch profile. I'm just wondering why Discount and Tire rack are advising against it?

  13. #28
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    Re: wheel/tire fitment

    You can go to this website to calculate the tire diameter
    http://robrobinette.com/tire_diameter.htm

  14. #29
    DBB
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    Quote Originally Posted by EChas3 View Post
    Deviation from OEM size isn't a big deal unless you can't compensate for the speedometer error. Perhaps Madtuner can adjust the VSS to correct that.

    Variance between front & back often leads to Stability Control System issues. (Side to side would be dangerous as well.) Each wheel has a speed sensor for ABS and Stabilty Control. AWD models don't use limited-slip differentials; they use open differentials and the Stabilty Control System to apply braking to the slipping wheel, just like F1 cars.
    So my variance in front to back tire diameter in a 245/40/19 front and a 275/35/19 rear is .1378 (26.7165 front - 26.5787 rear) which is a -1% variance. This is my current set up.

    For cosmetics I want to stay with the front 245/40/19 (26.7165 diameter) but go with a 275/40/19 rear (27.6614). Variance is -.09449 (26.7165-27.6614) or 3% variance. Hopefully my math is correct.

    So now armed with this knowledge will I be risking anything with traction control if I go with the 40 profile in the rear for looks?

  15. #30
    DBB
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    Edit front to back percentages were rounded. So current set up is -.05% variance from front to back and for looks set up is +3.4% front to back variance.ImageUploadedByTapatalk1371075005.702444.jpg here is pic of current set up. To me the rear looks too short at a 35 profile. That's why I want a 40 profile. But don't want to screw up stability control. Please help.

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