Kind of a specific tire question... i know, boring.
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2004-2007 Cadillac CTS-V General Discussion Discussion, Kind of a specific tire question... i know, boring. in Cadillac CTS-V Series Forum - 2004 - 2007; Hello all. '06 CTS-V and well... my rear tires are bald. Heh Here is the situation. I have changed over ...
  1. #1
    ImEpayne is offline Cadillac Owners Member
    Automobile(s): 2006 Cadillac CTS-V
    Join Date
    Feb 2013
    Location
    Boulder, CO
    Age
    24
    Posts
    61

    Kind of a specific tire question... i know, boring.

    Hello all. '06 CTS-V and well... my rear tires are bald. Heh

    Here is the situation. I have changed over to the STS-V staggered set of rims: 18's in front 19's in back. I am running 275/40/19's on the rear. Found a retarded deal on craigslist for a set of (4) Michelin Pilot Primacy's (any feedback?) I am not worried about the rear as I am running no spacers on the wheels and buying the same size tires. So rubbing won't be an issue. My concern comes with the fronts. I don't quite need fronts yet but might as well do them while its on the lift. Currently I am running 255/45/18's on the front. With the STS-V rims I had to put in a 5MM spacer so that the tire(if I'm remembering correctly) wouldn't rub on the upper control arm. But the 45 sidewall just looks gigantic and bubbley...

    My questions is: if I drop down to a 255/40/18, do I run the risk of rubbing again?



    Thanks everyone
    Eric
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  3. #2
    Andringa is offline Cadillac Owners Enthusiast
    Automobile(s): 2004 CTS-V Blk/Blk
    Join Date
    Nov 2009
    Location
    Wisconsin
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    Re: Kind of a specific tire question... i know, boring.

    What do you mean by " But the 45 sidewall just looks gigantic and bubbley..." ?

    I think that you might want a narrower tire, not a shorter tire.

    The stability control system in our cars assumes 4 tires with the same outside diameter. (It uses revolutions per second to calculate wheel speed.) Because of the stability system most people on the forum suggest keeping the difference in overall height of front to rear tires less than 3%. I think that going to a 255/40/18 would start to cause you issues since it would be significantly (6.1%) smaller than your rear tires.

    A narrower tire would look less "bubbly" and the stock size of 245/45/18 is only 3.4% smaller than your current rear tires.

    According to an online calculator:
    275/40/19 = 27.7"
    255/45/18 = 27.0" -2.6%
    255/45/18 = 26.0" -6.1%
    245/45/18 = 26.7" -3.4%

    This is all assuming that there isn't a way to tell the CTS-V stability control system that you have changed the size of the rear wheels. Obviously the STS-V was setup from the factory to run different overall tire sizes front to rear and has Stability control.

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