Winter is here. I just topped off the tire pressure. - Bimmerfest - BMW Forums



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  #1  
Old 12-07-2019, 11:14 AM
EconoBox EconoBox is offline
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Winter is here. I just topped off the tire pressure.

Inflated the tires to 32F & 36R.
What pressure do you like?

2010 manual
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Last edited by EconoBox; 12-07-2019 at 05:44 PM.
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  #2  
Old 12-07-2019, 11:34 AM
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Doug Huffman Doug Huffman is offline
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36 & 41
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Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
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Old 12-07-2019, 11:44 AM
x3brian x3brian is offline
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Quote:
Originally Posted by EconoBox View Post
Inflated the tires to 32F & 36R.

What pressure do you like?


What does your door say and what size tires?

We know your car is a base so wouldnít expect staggered tires and base 17Ē rims with 235/55/17 unless it got 18s.

If you have base 17s, my door sticker says 32 f and 33 r. Iíve always maintained that. Im on my third set of replacement tires. Never had issues in winter snow but always had good tread depth when winter hits since Iíve live in MD.


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  #4  
Old 12-07-2019, 11:46 AM
x3brian x3brian is offline
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Quote:
Originally Posted by Doug Huffman View Post
36 & 41


Show off. We know the x5 is bigger.

What size tires are you running?


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  #5  
Old 12-07-2019, 12:18 PM
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Doug Huffman Doug Huffman is offline
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Mein Auto: CPO2012 X5 35d M57(E70)
255/55r18

To a first approximation, tire pressure is weight on one wheel divided by footprint projected to the inner casing.

I am having a great time trying to find the actual calculation. I'm 75% through 700 pages of The Pneumatic Tire DOT HS 810 561
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Scepticism and Animal Faith (1923)
Scepticism is the chastity of the intellect, and it is shameful to surrender it too soon or to the first comer: there is nobility in preserving it coolly and proudly through long youth, until at last, in the ripeness of instinct and discretion, it can be safely exchanged for fidelity and happiness.
(The Works of George Santayana p. 65)

Eschew eristical argumentation. I am responsible for what I write, not for your understanding of it.

Last edited by Doug Huffman; 12-07-2019 at 12:23 PM.
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Old 12-07-2019, 02:56 PM
EconoBox EconoBox is offline
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Quote:
Originally Posted by x3brian View Post
What does your door say and what size tires?
app[/url]
I have 235/55/17 so I went 32F/36R

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Last edited by EconoBox; 12-07-2019 at 05:44 PM.
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  #7  
Old 12-07-2019, 03:32 PM
x3brian x3brian is offline
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Interesting. Exactly the same tires and car and they increased rear pressure 3 pounds between 09 and 10.

I just checked my manual and says 32f and 33r.


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Old 12-09-2019, 11:29 AM
DangermouseX3 DangermouseX3 is offline
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The stickers on my cars both say 32/32.

OP - what do you mean by "winter is here - topped off my tire pressure?"
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  #9  
Old 12-09-2019, 01:47 PM
EconoBox EconoBox is offline
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Cold air
volume decrease
top up
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  #10  
Old 12-09-2019, 02:04 PM
abscate abscate is offline
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That is some sort of PVneRTed behavior..
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  #11  
Old 12-09-2019, 10:03 PM
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Attacking Mid Attacking Mid is offline
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I guess I try to check my tire pressures much more often than seasonally. Realistically, I probably check every 4-6 weeks. I generally run 3 psi higher that what is listed on the door sticker (for all my vehicles) - except during snowy conditions where I'll drop the pressure to the recommended pressure. In really bad conditions, I have gotten out and let air out of the tires to further improve traction. I haven't had to do that with the X-drive vehicles, but I've had to with my RWD e46 and other 2WD vehicles in slick conditions.

AM.
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  #12  
Old 12-10-2019, 12:46 AM
Autoputzer Autoputzer is offline
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All my tires leak between a half-PSI and one PSI every two to three weeks. In the fall, with steadily falling temperatures, the pressure goes down even faster. In the spring, with steadily increasing temperatures, the pressures go down slower. Only adding about one PSI, it's no trouble to do it with a bicycle pump.
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Old 12-10-2019, 12:46 AM
Autoputzer Autoputzer is offline
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That is some sort of PVneRTed behavior..
Ideally.
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  #14  
Old 12-10-2019, 10:49 AM
woofster woofster is offline
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Quote:
Originally Posted by abscate View Post
That is some sort of PVneRTed behavior..
Quote:
Originally Posted by Autoputzer View Post
Ideally.
Here's an 'ideal gas LOL' for both of you!
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  #15  
Old 12-11-2019, 06:17 AM
DangermouseX3 DangermouseX3 is offline
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Quote:
Originally Posted by EconoBox View Post
Cold air
volume decrease
top up
Interesting.

Do you do the opposite in the summer?
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