Wheel and Tire Question

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Cadillac STS Forum - 2005 through 2012 Discussion, Wheel and Tire Question in Past Cadillac Vehicle Discussion; I am looking at upgrading the rims on my 2006 STS V6 from 17" to 18". I know the factory ...
  1. #1
    bbjorklund99 is offline Cadillac Owners Member
    Automobile(s): 2006 STS
    Join Date
    Apr 2011

    Wheel and Tire Question

    I am looking at upgrading the rims on my 2006 STS V6 from 17" to 18". I know the factory configuration for the 17" wheels is 7.5" wide on the front and 8" on the rear. I understand the factory configuration with the 18" wheels are all 8" wide. This brings me to the question.... since the wheels are all the same width does that mean they use the same size tires on both front and back? According to one of the online tire places it appears that they still run staggered tire sizes with the 18" rims even though they are all the same width. I thought maybe one of you guys who has 18" on your car could shed some light on this for me.


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  3. #2
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
    Automobile(s): 2006 STS4 V8 1SG & 2007 STS V8 1SE
    Join Date
    Jun 2008
    Cedarburg, WI

    Re: Wheel and Tire Question

    It's your preference. 235/50R18 & 255/45R18 are nearly the same circumference.


    Staggered setups shouldn't be rotated. Wider tires look good but may be more noisy. The treadwidth isn't really that different. I chose 4 Contiinental DWS 235/50R18 on my AWD for a quiet ride and rotate them once a year. I'm getting excellent wear and traction far exceeds the staggered OEM MXM's. What characteristics are most important to you?

  4. #3
    bbjorklund99 is offline Cadillac Owners Member
    Automobile(s): 2006 STS
    Join Date
    Apr 2011

    Re: Wheel and Tire Question

    I like the looks of the 18" tires on the STS. The 17" look small and don't look as nice as the 18's. As far as what I am looking for... I want the car to handle well and a quiet and smooth ride is important to me. The guy who had the 06 I now have put the same size tires on front and back even though the rims in the back are a 1/2" wider than the front. I haven't driven the car with the staggered size tires so I don't have a reference point but have no complaints about how the car drives with the current setup. With the 18" rims all being the same width it would make is easy to rotate the tires if they were all the same size. I am leaning toward going with the same size tire for the reason you gave. Thanks for the response.

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