12-02-2020, 11:02 AM | #1 |
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M850i runflats vs normal tires
Wondering if the community could help me out here as neither my future dealer nor BMW Sweden seems able to provide an answer.
Is it interchangeable to use non-runflat tires on a car factory delivered with runflats? The reason I'm asking what is perhaps a stupid question is that when I ordered my F32 in 2015 runflats were the only option from factory. I had heard a lot of negatives about runflats over the years and was a bit concerned in terms of ride quality, performance etc. My sales rep then said that runflat technology had evolved and those caveats were gone and that the car was also designed specifically for the characteristics of runflats - shocks etc were all designed with the harder tires in mind. Therefore, I was strongly advised to stick to runflats summer and winter tires as mounting non-runflats would alter the feel and behavior of the car to the point of affecting safety. I'm now about to get a used 2019 M850i that's delivered on 20" runflats. I'm not a massive fan of big rims, I prefer a more compliant ride and if given the option I would have preferred 19". First-world problems... So I'm thinking of getting non-runflats for my winter wheels and for the summer 20"s when the current ones are put out to pasture. If I look at the BMW online configurator it seems that for all rims on a new M850i there are two cost-neutral choices - runflats or normal tires. Would that affect anything in the manufacturing process or is it now perfectly fine to swap back and forth between runflats and normal ones (provided you don't mix of course) without drawbacks? And do you know if the serious uneven and massive tire wear issues reported on the 8 in other threads are related to normal or RFTs? |
12-02-2020, 11:45 AM | #3 | |
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Hope others can chime in with more of their experience and insights.
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12-02-2020, 12:17 PM | #4 |
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"Therefore, I was strongly advised to stick to runflats summer and winter tires as mounting non-runflats would alter the feel and behavior of the car to the point of affecting safety."
Based on that statement, BMW should not offer the following package at all: Cooling and High Performance Tire Package +$1,850 20" M V-spoke jet black wheels, style 728M with high performance non run-flat tires Else there would be TWO versions of each model - one made for runflat tires one for standard tires..... that is nonsense. Yes the feel will be altered but in a better way - smoother rides = higher comfort and not feeling every little uneven part of a road let alone holes or other major road defect. Should I add less weight? And and and and. Now that rep should explain how would this alter safety other than remaining on the road without a spare tire and having to call for help? Indeed it is not an "ideal" situation should it occur, but it does not make the car unsafe by any means! Nor does it damage or compromise any of its components. Plenty can be read and researched regarding runflat vs. non-runflat and one should decide what makes most sense for their driving needs. Fact is most people wish for non-runflat and avoid runflat tires in the 1st place for obvious reasons. Thus do not worry and mount if you please some nice sports NON-runflat tires as the ones offered in the high performance tire package. 20" wheels are just perfect for this car and its body chassis. Actually I am even leaning towards a nice 21" setup but not a priority of mine and I am first intending to perform a few more upgrades. 19" for winter is perfect, as anything below that makes for a strange stance in my opinion especially when looking at the car from the back. |
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12-02-2020, 02:46 PM | #5 | |
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12-02-2020, 03:15 PM | #6 |
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There is no such package available as in the US. However upon choosing the 728 M style wheels (which ever color) you have the option to choose between runflat tires or non-runflat. However, the 729 M (bicolor) and the 730 V-style wheels are only available with RUNFLAT ones - at least in the configurator when building a new one.
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12-02-2020, 03:16 PM | #7 | |
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Will call the dealer and say "let's do this" tomorrow |
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12-02-2020, 03:24 PM | #8 | |
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12-02-2020, 03:49 PM | #9 |
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Congratulation on your choice if you are going for it! You will love it.
All M850i I have looked at which are MY2019 did have the Motorsport engineering package (S33TA) included. Not sure there is any difference from one European country to another with regard to this package or if perhaps some early ones produced in 2018 do not feature the S33TA package? Most important thing is the one you will get does. |
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12-02-2020, 03:53 PM | #10 |
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Indeed and that shows it makes sense that BMW leaves this choice as they know many if not most will opt for non-flat tires when configuring the car given the option when selecting those wheels.
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12-02-2020, 06:16 PM | #11 | |
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12-02-2020, 06:31 PM | #12 | |
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12-10-2020, 10:58 PM | #13 | |
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12-11-2020, 06:50 PM | #14 |
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RJC, I will likely opt for the Pilots when I replace all four tires. There seems to be a design flaw in the Bridgestone non run flats which creates the abnormal wear. Odd, as I never had this problem with Bridgestone run flats on my 650. My M850i was built to order, but I have no idea how BMW determines which tire brand to put on at the factory since most others seem to have Michelin non run flats. Thanks for the advice.
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12-11-2020, 07:28 PM | #15 | |
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2019 M850i xDrive Coupe (06/19 Production)
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12-12-2020, 07:02 PM | #16 | |
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12-13-2020, 08:46 PM | #17 |
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My m850i has the high performance tyres (as posted above). I went from a 640d on run flats to the m850i on high performance.
The run flats are dog |
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12-14-2020, 02:46 AM | #18 |
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As I am often looking on the DE Bay for a set of winter wheels (though really more for next winter not this one), I have come across several 20" wheel sets with Bridgestone tires and they in fact did look abnormal - mostly irregularly worn out as can be seen on some of the pics posted by the seller. On other listings with Michelin tires I hardly noticed this. Now this could be just coincidence, but justed wanted to give this feedback.
My Michelin PS NON-runflat (car has just over 11.000 KM) tires look fine so far and regularly worn both on the inside and outside. |
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12-14-2020, 09:02 PM | #19 | |
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12-15-2020, 02:13 AM | #20 | |
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12-15-2020, 04:50 PM | #21 | |
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12-15-2020, 05:53 PM | #22 | |
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But other than that, is there such thing? I have seen aftermarket wheels as well as BMW wheels, supposedely "designed specifically for winter use and salt exposure" deteriorate or get really ugly from salt and corrosion. I have seen it on an F30 of a friend who follows every comma and dot BMW mentions, and guess what? His wheels got the "aluminium cancer" despite being what BMW defines as "winter complete set" and mine didn't (19" original non-winter set). Do you really think there is a difference in "winter resistance" between the 727 wheels and the 733 ones? Or between the 728 and the 730ies? It's just that 19" will give you better traction control, possibly use less fuel and be all together the better winter choice. I have yet to see or read anywhere that BMW have wheels that are more resistant to salt or any other agents. I am not interested in aftermarket/3rd Party wheels for winter. I opt for original ones and want to keep same size as summer. On all my previous BMWs I never had any issues with the bigger size and with the staggered setup. Based on my experience, and on where I live, I have no reasons for changing this. |
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