is everybody running a 38mm offset on 20" rims?
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, is everybody running a 38mm offset on 20" rims? in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; hey just got my taxes back and and im buying rims this week ik the bolt pattern is 5x114.3 or ...
  1. #1
    CadillacKid12 is offline Cadillac Owners Connoisseur
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    is everybody running a 38mm offset on 20" rims?

    hey just got my taxes back and and im buying rims this week

    ik the bolt pattern is 5x114.3 or 5x115, really doesnt make a difference does it?

    but what i'm wondering do i have lead-way on the offset or should i stick with a firm 38mm some say you can go to 40mm all tho i dont think anybody has

    thanks guys

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  3. #2
    mulescrote is offline Cadillac Owners Member
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    Re: is everybody running a 38mm offset on 20" rims?

    I owe taxes this year, but would like to know the same thing

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    CadillacKid12 is offline Cadillac Owners Connoisseur
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    Re: is everybody running a 38mm offset on 20" rims?

    seems most common, but i think the 2 bolt patterns dont matter

    since not alot of rim companies make a 114.3 the just go to 115

  5. #4
    odthetruth's Avatar
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    Re: is everybody running a 38mm offset on 20" rims?

    The .7 difference does make a difference. It will put strain on the wheel parts. Get them exactly for your size. Not for nearly close to your size. If you do decide to get them, get hubcentric rings.

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    txbest1980's Avatar
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    Re: is everybody running a 38mm offset on 20" rims?

    we have 5 x 115 and it does matter a lot. like the above stated, the 5 x 114.3 can and will eventually snap your studs right off without hubcentric rings. as far as offset, it all depends on the size of the wheels you want. you can get away with pretty much anything in the +35 to +42 range

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    CadillacKid12 is offline Cadillac Owners Connoisseur
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    Re: is everybody running a 38mm offset on 20" rims?

    they are 8.5 all around.. never understood the offset and how it works and dont know where to find a 20x10 rim for back and 20x8.5 for the front

    so TX ur saying get 114.3 if i can?

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    Re: is everybody running a 38mm offset on 20" rims?

    "Offset is the distance from a wheel's mounting surface on the hub to the center-line of the wheel, in millimeters. Negative offset means the mounting surface is towards the inside of the wheel. With positive offset, this surface is biased towards the outside. Typically, wider tires require more positive offset to avoid contact on the inner fender well."

    I have 20in by 8.5 with a +40mm offset...i have no rubbing on the inner fender at all...but i did have to roll my fenders front and rear, mine is as low as it can go with that size rim and tire (245/35ZR20)

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    z06bigbird is offline Cadillac Owners Connoisseur
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    Re: is everybody running a 38mm offset on 20" rims?

    Quote Originally Posted by txbest1980 View Post
    we have 5 x 115 and it does matter a lot. like the above stated, the 5 x 114.3 can and will eventually snap your studs right off without hubcentric rings. as far as offset, it all depends on the size of the wheels you want. you can get away with pretty much anything in the +35 to +42 range
    Very true about studs breaking, but then again, op will have three other wheels to support vehicle. lol

    Real tire shops will refuse to work on your wheels/tires if they recognize that you have wrong wheels (vs bolt pattern).

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    CadillacKid12 is offline Cadillac Owners Connoisseur
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    Re: is everybody running a 38mm offset on 20" rims?

    so then 5x115 is the way to go..... and my offest really should be with in 38-42mm

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    Re: is everybody running a 38mm offset on 20" rims?

    5x115 is the proper pattern, especially when getting into a 20" rim.
    I'm puttin hub rings on my 20s just have to pick them up, they ordered the wrong ones 2 weeks ago.
    I'm also running on 245/35/20 fit and ride perfect.

  12. #11
    CadillacKid12 is offline Cadillac Owners Connoisseur
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    Re: is everybody running a 38mm offset on 20" rims?

    thats wat size the tire comes with 245/35/20... mike are u running staggered or u 8.5 all the way around

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    Re: is everybody running a 38mm offset on 20" rims?

    Same all around...I didn't want staggard, don't want to mess with wheel speed sensors.

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    Re: is everybody running a 38mm offset on 20" rims?

    caddykid...i would run 5 x 115 if i was you

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    The Raven's Avatar
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    Re: is everybody running a 38mm offset on 20" rims?

    There are alot more 5x114.3 wheels out there since that is and has been the Ford Mustang's bolt pattern. Only thing is that most of those wheels are musclecar-ish and not really flattering to a luxury sedan.

    I've been over this many times on other forums in the argument "is it safe" etc. Naturally you are taking a small risk no matter what, but i've had 5x120 wheels on my LPE WS6 (5x120.65 stud pattern) for 5 years now. I've had the car up to 150mph, and run her through at least 8 SCCA sanctioned events with ZERO problems of any kind. I check my lugs every three months just out of good habit, and have never encountered a loose lug.

    From an engineering standpoint, you are looking at a difference of less than 0.1mm per lug hole, and the deflection of aluminum at even 80lb/ft is more than 0.1mm. In english this means that your wheel lug holes will deform before the studs flex at all.

    So it's certainly not as "safe" as the correct bolt pattern, but modern bridges have been built with looser tolerances and you drive over them every day and don't question it.
    Ikera and ClassyCaddys like this.

  16. #15
    74chvy glasshouse is offline Cadillac Owners Fanatic
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    Re: is everybody running a 38mm offset on 20" rims?

    22's fit or will they rub??

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