08-04-2021, 09:18 AM | #1 |
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Tire pressures for non-run flats?
I finally ditched my rock-hard Goodyear run flats for Michelin Pilot Sport A/S 4 tires. The recommended pressures in the manual or the door jamb are for run flats. In my case 35 and 39psi for non-staggered 19s. Is it different for regular tires?
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08-04-2021, 01:10 PM | #4 | |
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Yesterday, I replaced the 19-inch run-flats with standard 20-inch Michelin Pilot Sport A/S 4, and the car behaves like a totally different animal. I can't believe how quiet and compliant my car is now. The steering is so much better, and no more bottoming out on small potholes. It feels closer to the traditional BMW we all know and love. THIS IS HOW THE CAR SHOULD HAVE CAME FROM THE FACTORY!! I don't know why after all these years BMW still uses run-flats; they are absolutely garbage. Air pressure wise, I highly recommend 38 psi front and 40 psi rear for a good balance of ride comfort, compliance, and firmness. Last edited by Wanwansuii; 08-04-2021 at 04:54 PM.. |
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08-04-2021, 04:22 PM | #5 | |
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100% agree! BMW must have been in the pocket of the tyre manufacturers when it was released. It takes the 6 from being quite an uncomfortable luxury car to an actually comfortable luxury car! Plus...most shops will repair normal tyres if it's not anywhere dangerous, most shops near me wouldn't touch runflats! |
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08-05-2021, 08:14 AM | #7 | |
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08-05-2021, 09:16 AM | #8 |
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I run the recommended pressure on the door jamb that was for the run flats...and it works great for me. And yes, the regular (non-runflat) tires are way more appealing as a tire choice than the run flats were....and I'm running 2nd tier name brand tires...Toyo Extensa HP II tires.
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08-05-2021, 01:46 PM | #9 | |
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However, last week, the sidewall on the run flat on the 6 randomly burst and would hold no air. This is the second time it has happened in less than a year. |
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08-05-2021, 05:25 PM | #10 | |
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08-05-2021, 08:35 PM | #11 | ||
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08-05-2021, 09:08 PM | #12 |
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I wonder why the other German marques (Audi, Mercedes) don’t come with run-flats? Aren’t they meant for high speed on the German Autobahn?
I’m my opinion, the cost to benefit of run flats aren’t worth it. Especially since you can only drive up to 50 mph and up to 12-15 miles on the flat. So you definitely won’t be going Autobahn speed once the TPMS notifies you of a flat tire. They’re heavier than standard tires, noisier, they seriously take away from comfort, ride, and handling of the vehicle, and once punctured typically cannot be repaired. Not to mention the expense. Plus, we have TPMS…. |
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08-05-2021, 09:59 PM | #13 | |
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Those RFTs are better in only one thing compared to the regular ones - they run flat. |
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08-06-2021, 07:29 AM | #14 |
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While I'm not a big fan of run flats, it's more like 50 miles published and probably much more than that.
Last edited by Walt White Coupe; 08-06-2021 at 07:47 AM.. |
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08-06-2021, 08:50 AM | #15 |
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08-06-2021, 11:19 AM | #16 |
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Oh my apologies on the misinformation, for some reason I thought the iDrive told me 15 miles. Thank you for the correction
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08-08-2021, 07:05 PM | #17 |
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Opie 55 i run the same pressures in my Michelins Pilots 4S as I did in the god awful RFT.
Front : 38psi Back : 40psi its been said so many times before but ill add it again.... night and day compared with non RFT... i loath RFT, hard crashy dreadful tyres they are, and terrible in the wet... I'm sure you will appreciate the Michelins, they are like silk and stick to the road very well ! I carry a can of inflate foam in the boot well just in case... cheers |
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08-09-2021, 07:26 AM | #18 |
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Since the vast majority of flat tires are caused by slow leaks from nails, screws, etc., all that you should have is a small cheap air compressor to keep the tire inflated until it can be repaired.
Also, leave the nail, screw, etc. in place to serve as a temporary plug. Last edited by Walt White Coupe; 08-09-2021 at 08:05 AM.. |
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08-09-2021, 08:36 AM | #19 | |
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I have a small compressor that is a flat box that fits easily in the little place under the trunk floor where the tool kit is. But it is often not quite that simple. The flat I got last week that finally made me ditch the run flats was from a standard pneumatic roofing nail and was in the center of the tread. But I was about 60 miles from home and the nail did not seal the hole well. So I had to stop every 15 minutes to add more air. What is really needed is an air pump and one of the those kits to insert a plug. That is what I plan to carry from now on. |
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08-09-2021, 02:10 PM | #20 |
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If you ever tried to "insert" one of the plugs in a tire that is still on the car, I think you would have a different opinion. Heck, it's not even easy with the tire off the car. And to make matters worse, if you pull the nail and fail to get the plug installed then you are really screwed (no pun intended). Almost all tires can be safely inflated to 50 psi which could get you further. I'd rather stop every 15 minutes to refill the tire than take a chance of not being able to plug the tire. And I'd suggest that your experience was not typical. I've had two tires with nails in my Corvette (one that took two nails at the same time) and they held air more like an hour before needing to refill.
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08-09-2021, 08:12 PM | #21 | |
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08-11-2021, 04:39 PM | #22 | |
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