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Cadillac ATS General Discussion Forum Discussion, Run Flat Tires... in Cadillac ATS Discussion Forums; Hey all, BMW used run flats on their 3 series and no one liked them, loud, uncomfortable etc. But Cadillac ...
  1. #1
    Peyton is offline Cadillac Owners Member
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    Run Flat Tires...

    Hey all,

    BMW used run flats on their 3 series and no one liked them, loud, uncomfortable etc. But Cadillac decided to copy them so they can be as much like the 3 series as possible and I think it was a bad choice, I'd rather have summer or all season tires but question is, how long should they last? I've heard they last about 7,500 miles... which would be terrible. Also can I replace them with all-seasons when these wear out or am I kinda stuck with buying more expensive runflats that are noisy and I don't prefer?

    I have the 3.6 premium and with the bose noise cancellation I can hear the engine faintly but the tires are what generates most of the noise IMO.

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    Felton10 is offline Cadillac Owners Member
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    Re: Run Flat Tires...

    I was told the tires cost about $ 350 each to replace, but that I could also replace them regular all season tires when they wore out. Didn't tell me what the mileage life on them was. But with no spare-would be tempted to get them again.

  4. #3
    MASCAD is offline Cadillac Owners Member
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    Re: Run Flat Tires...

    Quote Originally Posted by Peyton View Post
    Hey all,

    BMW used run flats on their 3 series and no one liked them, loud, uncomfortable etc. But Cadillac decided to copy them so they can be as much like the 3 series as possible and I think it was a bad choice, I'd rather have summer or all season tires but question is, how long should they last? I've heard they last about 7,500 miles... which would be terrible. Also can I replace them with all-seasons when these wear out or am I kinda stuck with buying more expensive runflats that are noisy and I don't prefer?

    I have the 3.6 premium and with the bose noise cancellation I can hear the engine faintly but the tires are what generates most of the noise IMO.

    I suspect that the reason the ATS uses run flats has nothing to do with BMW at all but rather is more of a weight & space saving measure. Cadillac has used them for this very reason on previous models as early as 2004. Other manufactures likewise have and do use them for the same reason.
    RippyPartsDept likes this.

  5. #4
    Hoosier Daddy's Avatar
    Hoosier Daddy is offline Moderator
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    Re: Run Flat Tires...

    I think the main reason for the run flat tires is to improve fuel mileage (i.e. reduce weight). Basically they let them eliminate a heavy spare tire. Some manufacturers just replaced the spare with a can of stop leak and a small air compressor. Ford's version weighs around 5 lbs, MUCH less than a spare tire. Both solutions have resulted in some angry customers. I didn't much like it the first time I had a car without a spare. Now I appreciate the weight reduction, not just for mileage but for improvements in acceleration, handling and braking too.

    The run-flats can be replaced with regular tires which is what I plan to do when these wear out. Of course they will leave you stranded in case of a puncture unless you keep something in the car to stop a leak and re-inflate the tire.

    Run flats do not have to make for a stiff ride. Some of the initial complaints were due to the springs and shocks not being softened enough to compensate. The other side of that coin is that switching from run-flats to regular will soften the ride at some expense to handling.

  6. #5
    bluecrayon is online now Cadillac Owners Fanatic
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    I was told that "you shouldn't have to replace the tires for the 36 month lease" which is obviously a bunch of bs.....however I was also told that if I need to I can replace them with whatever I want.

  7. #6
    RonboATS is offline Cadillac Owners Member
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    Re: Run Flat Tires...

    I traded in a 2011 Camaro 2SS/RS with 11,000 miles on the ATS. The Camaro had the stop leak/air compressor method for replacing the spare tire. I don't want to jinx myself but in 32 years of driving I've had two flat tires. I'll dump the run flats for regular all-seasons when the time comes.

  8. #7
    ben.gators is online now Cadillac Owners Connoisseur
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    Re: Run Flat Tires...

    Quote Originally Posted by bluecrayon View Post
    I was told that "you shouldn't have to replace the tires for the 36 month lease" which is obviously a bunch of bs.....however I was also told that if I need to I can replace them with whatever I want.
    It is a common practice, especially among BMW owners, that they replace the run flat tires with regular, high performance tires and at the end of lease term they simply mount the run flat tires back and return the car.

    I am not sure what exactly your dealer mean by "you shouldn't have to replace the tires for the 36 month lease"?
    1- Because this is a leased car, you don't have the authority to change the tires.
    OR
    2- At the end of lease, you are not required to replace the tires with new one.

    I believe 1 is definitely wrong. You can do it.
    And 2 may or may not be true. If the tires are completely worn out, or damaged, they may (and I think will) force you to replace the tire or may charge you for the tires.

    Any idea?

  9. #8
    73JPS is offline Cadillac Owners Fanatic
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    Re: Run Flat Tires...

    Quote Originally Posted by ben.gators View Post
    It is a common practice, especially among BMW owners, that they replace the run flat tires with regular, high performance tires and at the end of lease term they simply mount the run flat tires back and return the car.

    I am not sure what exactly your dealer mean by "you shouldn't have to replace the tires for the 36 month lease"?
    1- Because this is a leased car, you don't have the authority to change the tires.
    OR
    2- At the end of lease, you are not required to replace the tires with new one.

    I believe 1 is definitely wrong. You can do it.
    And 2 may or may not be true. If the tires are completely worn out, or damaged, they may (and I think will) force you to replace the tire or may charge you for the tires.

    Any idea?
    Those are not the only two options... Option '3', and probably the most logical, is "Based on the number of miles included in a standard 36 month lease, you will not have worn the tires enough to require replacement".

  10. #9
    KXAM is offline Cadillac Owners Member
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    Re: Run Flat Tires...

    NOTE: All Corvettes have come with runflats for a long time. Mostly Goodyears and very frankly, they are C R A P! I replaced mine at 17,000 miles because they were far too noisy and the traction was getting worse and worse.. Our ATS at least has the Michelin ZP tires which are much better than Goodyear. I replaced my runflats with Hankook tires all around. Even with the 'vettes big sizes they only ran me $800, all-in and out the door. The Goodyears would have been closer to $1400. Michelin even more, like $1800! GM is doing the runflats to keep weight down and save a few bucks no doubt. For sure they are not trying to copy BMW.
    I keep a small compressor in the back and a can of Slime, plus I have the best AAA program. I am also a risk taker and have only had one or two flats in 50 some year of driving. Runflats are either you love them or you hate them kind of deal.
    Conservative folks tend to really like them as do most folks that wear tin foil hats. each to his own....

  11. #10
    Fraggy's Avatar
    Fraggy is offline Cadillac Owners Enthusiast
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    I have no desire to switch to conventional tires. The ride us waaay smooth enough.

    Everyte I switched in BMWs I always regretted it as it lead to suspension mods to take up the slop of the softer tires coupled with the mushy soft bushings they used to compensate for the stiff RFTs.

  12. #11
    ben.gators is online now Cadillac Owners Connoisseur
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    Re: Run Flat Tires...

    Quote Originally Posted by 73JPS View Post
    Those are not the only two options... Option '3', and probably the most logical, is "Based on the number of miles included in a standard 36 month lease, you will not have worn the tires enough to require replacement".
    I agree, that makes sense, and that's why I haven't replaced the run flat tires, yet!
    Do you know in average, how many miles will these run flat tires last?

  13. #12
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    GJB
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    Re: Run Flat Tires...

    According to the Michelin web site The summer tires that can't be rotated due to front/rear width difference have a tread wear warrantee at half that of the all season ZP which are 30K for tread wear and 45k for workmanship. So summer ZP on the ATS 15K and the all season 30 K.

  14. #13
    bungee91 is offline Cadillac Owners Fanatic
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    I have no complaints with the Bridgestone Potenza REO5A's that the premium RWD's come with. They handle exceptionally well, and aren't noticeably noisy. These are summer tires, so I switch to a dedicated set for winter and that helps save some miles on them.

    I previously had Michelin Pilot Super Sports (these are non run flats) on my Z4 M and even though they may have been a tad bit better I'd be lying if I said I really noticed the difference.

  15. #14
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    M5eater is offline Cadillac Owners Connoisseur
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    Re: Run Flat Tires...

    Quote Originally Posted by Peyton View Post
    Hey all,

    BMW used run flats on their 3 series and no one liked them, loud, uncomfortable etc. But Cadillac decided to copy them so they can be as much like the 3 series as possible and I think it was a bad choice, I'd rather have summer or all season tires but question is, how long should they last? I've heard they last about 7,500 miles... which would be terrible. Also can I replace them with all-seasons when these wear out or am I kinda stuck with buying more expensive runflats that are noisy and I don't prefer?

    I have the 3.6 premium and with the bose noise cancellation I can hear the engine faintly but the tires are what generates most of the noise IMO.
    They last 7,500 miles because you bought a car with summer tires which have 140 tread wear.

    7.5-10K is about right for a 140 Treadwear tire.

    Personally I'm glad they're RFT's it frees up space in the already microsopic trunk that would otherwise be occupied by a spare or a canister.

    if you would still rather not have them, get AAA or equivilent.

  16. #15
    mikesul is offline Cadillac Owners Enthusiast
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    Re: Run Flat Tires...

    I took the 18" RFT set of wheels and tires off at 230 miles. Replaced them with 18"x9" rims and 255.35.18 tires by Kumho. Much better roadhandling and traction in the rain. Have the original set for sale, if anyone is interested PM me.

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