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2Addicts | BMW 2-Series forum Technical Topics Wheels and Tires -- Sponsored by The Tire Rack Runflat Tires?

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      03-02-2015, 02:37 AM   #1
huma
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Runflat Tires?

For some reason, I thought all the RFT that came from the factory were Michelins. Mines came with Bridgestone S001.

In the door jam, it says cold psi at 32 for the front and 38 for the rear. The dealer had them at 40 for both. I lowered it to the door specs, but I'm confused if this is the right pressure if they have been using different stock tires before. On the tires itself, it says max psi of 51.
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      03-02-2015, 03:03 AM   #2
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The non-Run Flats are Michelins and I don't remember off the top of my head but I do believe the run flats are either Bridgestones or Pirellis so it sounds right.
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      03-02-2015, 03:57 AM   #3
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My 328 came with bridgestones. I think another option they use is continental.

Dealers always seem to pump up the tires too high. Mine always come back from service with at least 40 psi. I have adaptive suspension so I don't feel it so much but in previous bmws I noticed the harsh ride straight away.

From lots of trial and error I find 35psi all round is a good number for comfort and tire wear.
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      03-02-2015, 05:21 AM   #4
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My 228 m sport came with bridgestone summer only runflats..never bothered to check what psi they were at before I took them off.
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      03-02-2015, 08:49 AM   #5
DGR TSR
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I purchased a M235i with Michelin Pilot Super Sport tires.

The tires are great, but we live very far from any tire repair shop.

Can I in future years put (hopefully Michelin) run-flats on the same rims?

Last edited by DGR TSR; 03-02-2015 at 08:49 AM.. Reason: clarity
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      03-02-2015, 10:28 AM   #6
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I have those S001s and that's what I set them too. 32. 38. On the tire it says MAX of 51. Meaning when thy warm up. Stick with the door jam cold pressure and you should be fine.
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      03-02-2015, 10:31 AM   #7
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i found lot of dealers will just inflate tires to 40psi square even non-bmw dealers.... not sure why
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      03-02-2015, 10:34 AM   #8
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Quote:
Originally Posted by huma View Post
In the door jam, it says cold psi at 32 for the front and 38 for the rear.
Yes, you are correct. Proper tire air pressure is determined by the vehicle manufacturer and is set to best fine-tune a tires capabilities to their specific vehicle make and model. Using what BMW has on the door jam decal is the smart and safe way to go.
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      03-02-2015, 10:48 AM   #9
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Yes, the door jamb values are safe, However, they may be overkill. They are the mandated values which correspond to the maximum load of the vehicle. If you have the full load permitted of passengers and cargo, these would be the proper values to use. Notice the same label shows the full capacity for seating as well as the maximum load weight which go along with those pressures.

OTOH, the max cold pressure stamped in the sidewall is not a value related to operating usage...it is the value which is the max capability of the tire to contain air pressure when cold.

I haven't had a chance to go back into the owner manual, but there may be a listing for ordinary usage (driver...little to no cargo) which is likely in the mid 30s, depending on the aspect ratio of the tire. But, if you find the max setting isn't too harsh and bumpy, it's within safe operating limits.
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      03-02-2015, 01:31 PM   #10
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I have S001s also.

I feel the car understeers at 32F / 38R.
I am now running 36F / 38R and see if that makes a difference.
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      03-02-2015, 06:04 PM   #11
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Quote:
Originally Posted by x5mad View Post
Dealers always seem to pump up the tires too high. Mine always come back from service with at least 40 psi. I have adaptive suspension so I don't feel it so much but in previous bmws I noticed the harsh ride straight away.

From lots of trial and error I find 35psi all round is a good number for comfort and tire wear.
The car's come from BMW pumped up to nearly max tire pressure (high 50's-low 60's). When the tech's take the new cars in for PDI they take the spacers out of the suspension & deflate the tires.

Quote:
Originally Posted by MG 228i View Post
I have S001s also.

I feel the car understeers at 32F / 38R.
I am now running 36F / 38R and see if that makes a difference.
The stock values are set up to understeer since understeer is a lot easier to manage than oversteer. The closer you get to even front-back pressures, the more neutral your car will seem.

I run 36/38 on my ZHP now and it's pretty ideal & neutral feeling.
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      03-03-2015, 12:08 AM   #12
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Has anyone else noticed that the tires seem to deflate faster than normal? I've put on about 6500 miles and have had to pump up the tires a few times.
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      03-03-2015, 01:06 AM   #13
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Your suppose to check the tires regular and haven driven some 6500 miles they should have been more than just a few times. I've actually found run flats don't lose hardly any air. You can program the car to show just a small drop in air. Once you programmed the car then come back with how often you pump air in. Next thing you guys will require an alarm and why not as your guys need seat belt, lights left on, keys left in the car, park brake is on alarms.
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