Tire Size
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Suspension, Brakes and Tires Discussion, Tire Size in Item Specific Cadillac Discussion; On my 99 de ville the recommended tire is 225/60-16. I want to keep the stock rims. What is the ...
  1. #1
    gjt536 is offline Cadillac Owners Member
    Join Date
    Jul 2003
    Location
    Elgin Illinois
    Age
    53
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    Question Tire Size

    On my 99 de ville the recommended tire is 225/60-16. I want to keep the stock rims. What is the widest tire i can run without worring about rubbing?
    and if i am able to go to a wider tire, how will this affect ride and road noise?
    thanks for any help.
    g

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  3. #2
    RAD
    RAD is offline Cadillac Owners Member
    Automobile(s): 1992 STS, 1993 STS, 2000 STS
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    Jan 2004
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    Re: Tire Size

    I've got 255/50x16 Michelin Pilots on '97 STS mags. This is on my '93 STS lowered ~1.5 inches with Eibach springs. That puts a little over 7 inches of rubber on the ground. No problems whatsoever. The diameter is so close to stock, that the speedometer error is 2.2% Ie, 60mph read = 58.7 actual.

    As far as the ride quality, understand that changing the aspect ratio of the tire to a smaller factor (60 to 50 series) will allow more roughness from the road to be translated back to you through the steering and suspension. (Just plain less rubber between the road and the axle). Another factor that directly affects the component of ride quality is the speed rating of the tire. My 'Z' rated (150+ mph) are 'harsher' than the same tire in 'H' (130 mph) rating. It all depends on your personal requirments, but in your application, it sounds as if 'H' rating will be fine.

    Regarding road noise, that really depends on the tire manufactuer and the tread design you're comfortable with. The Michelin Pilot XGT Z-4's I have on my '93 STS are very quiet for a high performance tire.

  4. #3
    Budabear's Avatar
    Budabear is offline Cadillac Owners Member
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    Dec 2003
    Location
    Yonkers, NY
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    66

    Re: Tire Size

    Quote Originally Posted by gjt536
    On my 99 de ville the recommended tire is 225/60-16. I want to keep the stock rims. What is the widest tire i can run without worring about rubbing?
    and if i am able to go to a wider tire, how will this affect ride and road noise?
    thanks for any help.
    g
    The most economical change you could make would be 235 60 16 without going through suspension issues. The one other size you could use would be 245 55 16 however there is only perhaps about two tires on the market that are extremely high priced at this size and I don't like the brands.

    The following is a partial excerpt from a listing I just happened to have placed earlier today:

    "I live in NY and took the car for a ride up to MA. this past weekend with my new FALKEN ZIEX ZE-512 (235/60/16) tires and the car had proven itself to be one of the best handling cars that I ever had from BMW's to Mark VII's. I would just like to get the suspension adjusting the way it should and be able to clear the code which keeps coming back.

    BTW. To hit upon some of the tire issues out there I feel that the Japanese tires on the market are a much better deal and outperform the american tires at half the price. I was originally planning to buy the Sumitomo
    Ultra High Performance All-Season HTR+ but I decided to go with the brand new Falken Ziex ZE-512 Ultra High Performance All-Season which was review by consumer reports recently and got excellent reviews. Before switching to the Japanese tires I used to buy Dunlops because they were rated the best for wet-dry-snow traction out of all the rest (Michelin, Pirelli, Conti, etc...) in High Performance All-Season tires.

    http://store2.yimg.com/I/yhst-7540290329295_1782_689654


    The Tire Rack http://www.tirerack.com/index.jsp is the best place I've found to be able to compare the ratings of the major tire brands. They sell just about everything including the Sumitomo's but unfortunately not the Falken's."

  5. #4
    gjt536 is offline Cadillac Owners Member
    Join Date
    Jul 2003
    Location
    Elgin Illinois
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    Unhappy Re: Tire Size

    well....thanks guyz.... but even more confused now.
    one no modz required, one modz required,
    anyone else care to comment pleeze?
    Budabear thanks for including the tire brand, that is good info as i have been looking at the same.
    Rad did u do anything to clear the additional width of the tires?
    thanks again all
    g

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