Last post on Jul 23, 2013 at 5:49 PM
You are in the BMW 5-Series
What is this discussion about?
BMW 5 Series, Car Safety, Tires, Wheels, Sedan, Wagon
#99 of 136 Re: BMW tires and wheels [busiris]
Mar 13, 2012 (10:10 pm)
It is absolutely true that the lower the profile tire and the stiffer the sidewall, the less "give" you are going to have, and the more problems you will have.
But, I am comparing apples to apples here: a 2011 BMW 535xi with the standard 18" wheels and 45 profile tires against other cars with tires of similar size and profile.
I have driven over 500,000 miles in cars with 17" and 18" 45 profile tires over all kinds of roads on three continents. And, as noted in my post, I have now tested a sampling of such cars over the same pothole at the same speed.
ONLY the 2011 535xi exhibited this problem. I believe that is a combination of the very stiff RFT tires and a suspension design that is not suitable for our potholed American roads. You would probably never encounter this problem in Germany. But our roads are much worse than theirs.
This would not stop me from driving this car in an urban area, but we no longer trust where it could leave us stranded a long way from civilization.
I would love to hear from anyone who has a 2011 5 series and who has replaced the RFTs with conventional tires. Does this solve the problem? Does the suspension still crash? Have you had any tire or wheel damage since making the change?
#100 of 136 5 blown tires since Sept 2011
Apr 01, 2012 (9:08 pm)
I leased a 2011 535xi with the M Sport package. To date, I have blown out 5 tires due to driving over pot holes. I have never seen anything like this, and the previous post about this being exclusive to this model BMW is accurate. It's a combination of the suspension, rim design and tire. The car feels like it is about to break into two pieces and as a result the tires blow or bubble.
BMW has replaced all the tires at no cost. This issue, along with the slow tip in at throttle and I am hugely disappointed in the car. Working to return it to BMW this week.
#101 of 136 Re: 5 blown tires since Sept 2011 [rand_the_fin]
Apr 02, 2012 (9:58 am)
Either you purchased the wheel & tire insurance or you must have the most understanding and sympathetic BMW dealer in the country!
#102 of 136 Re: Have a few questions...
Apr 02, 2012 (12:11 pm)
What type of rims and tires do you have? How big were the potholes? Where do you live? Did the tires blow up?
#103 of 136 Re: 5 blown tires since Sept 2011 [rand_the_fin]
Apr 05, 2012 (10:05 pm)
The M sport package includes 19" wheels with lower profile tires, so I can readily understand why you would be having even more problems than I.
How did you get BMW to pay attention to you? They told me that I had to go through my dealer. So, I got the sympathetic service manager at the dealer to contact BMW on my behalf.
Through the service manager intermediary, BMW has just blown me off. Told me that they are are not aware of any problem with F10 tires, wheels or suspension.
Just for good measure, they informed me that replacing the RFTs with conventional all season tires would void my warrantee on anything relating to wheels, suspension or steering.
#104 of 136 Re: 5 blown tires since Sept 2011 [rand_the_fin]
Apr 05, 2012 (10:22 pm)
Consumer Reports complained about the (non sport) 535i they tested crashing over sharp bumps so hard that it sent shudders through the entire car.
Car and Driver had six bent rims and two blown tires in 40,000 miles on their 550. They blamed wheels that were too soft. I think that it has more to do with the suspension design combined with the very stiff RFT tires. Probably fine for German roads, but not for the U.S.
#105 of 136 Other vehicle wheel problem
Apr 06, 2012 (2:25 pm)
I've not had any problems yet with my BMW (535GT - just turning 1-year old), and the only other vehicle I ever had to replace a wheel on was an Audi A6 - one bent so much on the rim it wouldn't hold air, the other enough so it couldn't be made not to vibrate at speed. I still contend that the lower the profile tire you go with, the more issues you will have, and anyone using the 20-22" wheels on any of these cars is just asking for major hassles. Maybe it's an issue with the RFT being stiffer - this may transmit more force to the wheel since it doesn't deflect as much as a conventional tire; but, the lower the profile, the stiffer it has to be, just making the problem worse. My vehicle is a tool - I care about how it operates, not so much on how it looks. I'm not out to impress anyone, and I can't see it from the outside when using the thing as a transportation tool. As long as it's comfortable, and does what I ask of it, I could care less about whether the wheel fills the wheelwell, and I'll take the more resilient, higher profile tire.
If you must have the bling, heed BMW's warnings, and take your chances. They install 18" as stock for a reason. Now, if your need includes track time or slalom, that's a different issue, and you don't normally find potholes at the track!
#106 of 136 Re: 5 blown tires since Sept 2011 [atalaya505]
Apr 06, 2012 (3:06 pm)
In a word, what you were told is Bulls--t!
As long as the tires and wheels are the stock size that came on your car, BMW cannot force you to run RFTs on any of their models.
Warranty is not affected.
Either you misunderstood what you were told or your dealer is misleading you, intentionally or otherwise.
Far too many owners have ditched their RFTs for GFTs with no problems.
As an example...http://blog.tirerack.com/blog/chads-742-on-performance-tires-and-wheel- - s/switching-from-oe-run-flat-tires-to-non-run-flat-tires
I suggest you contact a different dealer and ask that question.
#107 of 136 Re: Other vehicle wheel problem [james27]
Apr 07, 2012 (8:55 pm)
But, I am not sure how well your experience with your F07 GT predicts what someone can expect with an F10 sedan. Your GT has a longer wheelbase, different suspension tuning and over 25% more ground clearance than the F10 sedan. And, if you have the standard 246/50 R18 tires, your tires have about 20% more sidewall flex height (the distance between the tread and the bead for the rim) than the standard 245/45 tires on the sedan.
All of these help to give you a lot bigger safety margin when you hit a pothole.
I would be really interested to know if your car shudders all over when it hits a pothole or other sharp impact. Does the impact reverberate through the entire body? It does on the F10 sedan.
Please note that NOBODY in this recent discussion is talking about huge wheels and super low-profile tires. These can cause problems on any car.
As I stated in my original post, my F10 535xi has the standard 18" wheels -- which, in the case of the sedan, means 245/45 tires.
A 45 profile tire is pretty much standard base spec for almost any performance sedan. And, as Shipo said in an earlier post: "245/45 R18 tires should be more than adequate to deal with all but the nastiest of road obstructions". He/she is absolutely correct -- which is part of the reason why I have never bought a car with anything lower than 45 profile tires.
However, the fact is that this does NOT appear to be true with the F10 5 series. I lost a wheel to a pretty garden-variety pothole, and many others are reporting the same thing. When we hit that pothole the impact was so sharp that my wife thought that the car had slammed into a metal bar on the road. Other cars were bumping over the same pothole without any sign of distess
This lead me to conduct the little pothole comparison test we ran in LA. This was run with current cars ALL of which were fitted with 17" or 18" 45 profile tires. The BMW was the only one to have a severe reaction over the test pothole. What I don't know is how the BMW would have fared if, like the others, it had not been wearing run flats.
Of course, stiff run flats are going to transmit more impact shock to the suspension . But, if run flats were the sole cause of the problem, why don't other Bimmers react like they have slammed into something and shudder all over the way the F10's do when they encounter a hard, sharp impact?
This is at the heart of what I am trying to figure out: If the stiff run flats are causing all the problems, switching to non-run flats (with a Conti Mobility kit and/or a spare in the trunk) should take care of things. But, if a soft F10 front suspension that bottoms out too easily is part of the problem, then switching to softer non-run flats might decrease the chances that a pothole will bend a rim, but increase the chances that it would blow out or bubble a more flexible tire!
We currently have a beautiful 535xi sitting in the garage because we donít dare use t for the long distance driving we bought it for. BMW will not help. It will not condone using anything but approved run flats on these cars. I am hoping that some of you on this blog may have some knowledge or experience that would help.
#108 of 136 Re: 5 blown tires since Sept 2011 [busiris]
Apr 07, 2012 (9:17 pm)
I had seen the Tire Rack blog entry. And, if I had anything other than an F10 5 series I would already have placed my order at Tire Rack for four Conti Extreme Contact DWS non-runflat tires. My own experience with these tires has confirmed that they really do provide superior snow traction for the first 20,000 miles or so of tread life. (Not as good as proper winter tires, but significantly better than any other all season I have ever used -- perfect for someone who is going to drive across the Arizona desert and end up in the mountains of New Mexico.)
The thing that is stopping me is that I have now had a couple of experiences with an F10 5 series hitting a modest-sized pothole that other cars take in stride with a "bang" and a shock that travels through the entire body of the car. I don't know if the front suspension is bottoming out, but this is sure what it sounds like -- and feels like.
My experience is consistent with the experiences that some of the magazines are reporting -- and what I am starting to hear from some other F10 owners.
If the F10 front suspension really is bottoming out when it encounters a pothole, changing from run flats may not solve the problem.