Will 18 inch rims fit my Eldorado
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Will 18 inch rims fit my Eldorado in Past Cadillac Vehicle Discussion; Howdy fellow Eldorado and Cadillac brothers and sisters. A great deal on after market 18 inch rims has presented itself ...
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    JackFunTeach is offline Cadillac Owners Member
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    Will 18 inch rims fit my Eldorado

    Howdy fellow Eldorado and Cadillac brothers and sisters.
    A great deal on after market 18 inch rims has presented itself to me. A friend of mine has these beautiful mantis rims that were formally on his '04CTS and 05 STS. I rode in his car on several occasions, and they had no issues but smooth traction and all day comfort. I really like the shiny chrome aggressive look but I want to keep them as spring fall summer tires. Any input whatsoever would be appreciated.

    Does anyone knows if 18 inch rims will fit on my 2002 or 2001 Eldorado??
    If anyone has successfully done so, what size tires did you use that didn't rub against anything??
    225-60-16 is stock. I would like to stay with a 55 to 60% profile in order to keep things smooth. Plus low profile does not always look good, but I may not have many options here.
    Jack

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    MoistCabbage's Avatar
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    Yes, the rims will fit. You don't have any options on profile. You have to keep the outside diameter of the tire within ~1/4" of that of the original tire. More rim height = less tire sidewall height. A 225/50/18 would be very close.

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    JackFunTeach is offline Cadillac Owners Member
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    Re: Will 18 inch rims fit my Eldorado

    ahh, I get it, so I should run a side by side dimension comparison

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    MoistCabbage's Avatar
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    I edited my post with a recommended size. Your 225/60/16's are 26.6" in diameter. The 225/50/18's are .3" larger.

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    Submariner409's Avatar
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    Re: Will 18 inch rims fit my Eldorado

    You can go into www.tirerack.com and compare all the specs for your original factory tires and any other you desire. As long as the outside diameter is within 0.25" or so you can use any rim you want - heck, you could run 27" rims, no tires, and all the speedo and PCM calibrations would be good.

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    JackFunTeach is offline Cadillac Owners Member
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    Re: Will 18 inch rims fit my Eldorado

    Quote Originally Posted by MoistCabbage View Post
    Yes, the rims will fit. You don't have any options on profile. You have to keep the outside diameter of the tire within ~1/4" of that of the original tire. More rim height = less tire sidewall height. A 225/50/18 would be very close.
    Thanks for your help. I just did the side by side overall diameter comparison. With the new tires @ 245-40-18, I am 7/8 of an inch LESS than the original tire. When you say it needs to be within a quarter inch of original, I am thinking that you mean it has to be less than a quarter inch bigger, but smaller is "OK" in terms of whether it will fit and function. I am aware of how the speedometer will be overstated, but it terms of function, I am thinking I will be ok.

    The width is going to be about an inch bigger, I looking at the wheel well, and hope that I will be ok there to. Any thoughts?

    Jack

    ----------

    Hey Submariner, I am understanding the 1/4 inch to be withIN the original. So, I did that comparison and found it to be about an inch less, so I should be ok, but my width is an inch bigger...

    By the way, I have my new to me F150 being painted gloss black, and it looks just like a brand new truck. All going good....who needs food and furniture. lol

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    MoistCabbage's Avatar
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    By within 1/4", I mean either way. Obviously, a smaller tire won't have rubbing issues, but the speedometer/odometer/MPG readings will be off, possibly shift points, and it usually looks really goofy. Also, the lower profile the tire, the more you're going to feel road imperfections.

    As for the 240 width, rubbing would be minimal at full lock, if at all.
    ctmoney219 likes this.

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    Re: Will 18 inch rims fit my Eldorado

    To preserve original speedo and engine management calibration your "new" tires MUST be within 0.25" of the original tire size on the driver's door sticker.

    An inch or 0.75 inch of OD change is way out of spec. Good luck.

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    JackFunTeach is offline Cadillac Owners Member
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    Re: Will 18 inch rims fit my Eldorado

    Sounds to me that I should get a bigger tire. I think it will work for now, but I will take you suggestion.

    Thanks so much.

    jack

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    Re: Will 18 inch rims fit my Eldorado

    The largest rim you can fit on an Eldorado with no modifications is 27" (keeping the 225mm width and same offset). On such size rim you save the money on tires (you don't need any).

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    Re: Will 18 inch rims fit my Eldorado

    Jack, Go into TireRack and look up the specs for your original tires (if you know what brand they were) or find the specs for a midrange-price Goodyear Eagle or Michelin all season tire. Look at the original outside diameter and revolutions per mile specs. Keeping the original tire OD - or very close - keeps the original design revolutions per mile close, so it doesn't throw off vehicle calibrations.

    Compared to original tire size/calibration, a tire that rolls less revolutions per mile (larger OD) will give you low speedo readings, while a tire that rolls more revolutions per mile (smaller OD) will give you high speedo readings. ALL tires within one size (say 235/55/17) will not have the same exact OD, so revs per mile will vary slightly - but the differences will be slight at worst.

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    JackFunTeach is offline Cadillac Owners Member
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    Re: Will 18 inch rims fit my Eldorado

    Howdy submariner, I took your advice, and found the Goodyear Eagle LS at the size of 225 – 50–18 to be within a quarter inch of stock OD. The revolutions per minute within 1% change. This should keep me on track and enjoy my new wheels all the same, excellent advice thank you very much. Jax

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    JackFunTeach is offline Cadillac Owners Member
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    Re: Will 18 inch rims fit my Eldorado

    Just to close the loop, I put on the new 18 inchers, and used the excellent advice of matching the OD and RPMs.

    Lookswise: Awesome Posum.
    Handling Wise: Better than ever, and NOT too much road feel. Coming from a BMW, this is the perfect compromise of comfort and sports control.
    I wanted less profile, and I got it.

    Would I do this again knowing how it plays out? Hell Yes!

    Thanks, Great Forum.

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    Re: Will 18 inch rims fit my Eldorado


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    How close is center bore on wheel compared to stock? The same ID?

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