Tire pressure for non-run flat tires (2015 F15 X5)

whiteX5_F15 · 07-19-2019, 09:30 AM

I cant seem to find a definitive answer for this. Recently went with a non run flat tire on the X5 (NON staggered - 255/55R18). So all the same wheel and tires all around. I have seen different answers to what PSI to run in the new tires. Some say to stick with the what the psi says on the inside of the door, 41 in the rear and 33 in the front. Others say to run the same psi all around. Looking for some guidance here on the right psi to run. For those that say "it's all about preference"....I am really just trying to to be safe and prolong the life of the tires.

tntp · 07-19-2019, 09:59 AM

I got my non-runflats at Costco and they put 33 for Front and 36 for rear with Michelin. My old door sticker says 32/39. The door sticker is for runflats only. You will initially feel the ride is softer with non-runflats, so increase the PSI a bit, then gradually reduce the PSI to your comfort. Also inspect the tire wear when you get 2-3k miles on it and making adjustment accordingly, then rotate the tire every 10k or year. if you are OCD, go with 5k!

Violator · 07-19-2019, 10:10 AM

Here is what BMW says...good luck

Qsilver7 · 07-19-2019, 10:50 AM

Quote:

Originally Posted by whiteX5_F15

...I am really just trying to to be safe and prolong the life of the tires.

If that is what you want to do...then I suggest you start with the BMW PSI recommendation in the owners manual (graciously posted above by Violater)...following the recommendation for which ever model (engine weight differences considered) you have and other options listed + number of passengers and cargo.

alphaod · 07-19-2019, 03:18 PM

Non-runflat tire pressure and runflat tire pressures are the same for me.

ems328i · 07-19-2019, 04:59 PM

I think it's personal preference, I tend to run slightly higher psi than the BMW manual states for a non-staggered 20" setup, just because it handles better in the turns (for me). I run 42 psi all round with just me, but I will bump it up for family vacations whe the car is fully loaded. YMMV

duercos · 07-19-2019, 08:48 PM

Do you guys go by your cold tire pressure or the hottest it gets on highways on a hot day?

Road Carnage · 07-20-2019, 06:26 AM

Always check and adjust tire pressures cold.

duercos · 07-20-2019, 09:17 AM

Quote:

Originally Posted by Road Carnage

Always check and adjust tire pressures cold.

I thought so too, but in the summertime, the pressure could go from 38psi being stored in a cool garage to 45+ being driven on a hot asphalt? It says "never inflate over 40 psi" on my oem runflat pirelli?..

ajob · 07-20-2019, 10:42 AM

Quote:

Originally Posted by duercos

Quote:

Originally Posted by Road Carnage

Always check and adjust tire pressures cold.

I thought so too, but in the summertime, the pressure could go from 38psi being stored in a cool garage to 45+ being driven on a hot asphalt? It says "never inflate over 40 psi" on my oem runflat pirelli?..

That's a good point.
It means that you should not inflate (cold!) tires above 40 psi, not that you should never operate them above 40 psi.

A 40 psi cold inflated tire may reach 50 psi when hot (or, partially, if you climb real high to lower external pressures) - that's ok by design.

F15GorDe · 07-20-2019, 02:11 PM

You know that your inflation pressures are close to correct for your application when the difference between cold/hot pressures yields a difference of less than 10% between the two at normal cruising speeds. Aggressive driving and heavy braking will add to the temperature and will bump up your reading.

The pressures on the door frame label are excellent initial starting points for the majority of drivers and will satisfy most everyone. But, be honest with yourself, are you checking tire pressures monthly?

ComasF15 · 07-20-2019, 04:43 PM

Tire pressure is a engineered number between the tire manufacturer and vehicle manufacturer.

The correct pressure is designed to bring the tire to the correct operating temperature.

KingBiscuit · 11-25-2019, 07:05 PM

If it's possible I think I'm more confused...

And this is for run-flat... right?

F15GorDe · 11-25-2019, 07:25 PM

Quote:

Originally Posted by KingBiscuit

If it's possible I think I'm more confused...

And this is for run-flat... right?

Yes

Picasso · 11-25-2019, 08:33 PM

Stick to what Violator posted in owners manual: 33/41 in your case

The Libertine · 11-26-2019, 04:47 AM

Quote:

Originally Posted by Road Carnage

Always check and adjust tire pressures cold.

Agree.

KingBiscuit · 11-26-2019, 09:20 AM

Quote:

Originally Posted by The Libertine

Agree.

That's what I did and will stick with. Thanks for the help.

The Libertine · 11-26-2019, 12:43 PM

Quote:

Originally Posted by KingBiscuit

That's what I did and will stick with. Thanks for the help.

You’re welcome.

JamesInSJ · 11-26-2019, 12:48 PM

IIRC tire pressure recommendations are at ~70 degrees F. Drop about 1 psi for every 10 degrees F colder, and add 1 psi for every 10 degrees F warmer. Also noteworthy is if your car is parked outside, are the tires on one side exposed to sunlight or not. I've had tires on the sunny side measure ~2 psi higher just being in direct sunlight after they were set to the same pressure in the garage just a day or two prior. Surface temperatures measured with a laser thermometer confirmed a 20-25 degree difference, so after an hour+ of direct sunlight warming up one side you can get these wide differences.

07-19-2019, 09:30 AM	#1
whiteX5_F15 Registered 3 Rep 4 Posts Drives: 2015 X5 F15 Join Date: Oct 2018 Location: GA iTrader: (0)	Tire pressure for non-run flat tires (2015 F15 X5) I cant seem to find a definitive answer for this. Recently went with a non run flat tire on the X5 (NON staggered - 255/55R18). So all the same wheel and tires all around. I have seen different answers to what PSI to run in the new tires. Some say to stick with the what the psi says on the inside of the door, 41 in the rear and 33 in the front. Others say to run the same psi all around. Looking for some guidance here on the right psi to run. For those that say "it's all about preference"....I am really just trying to to be safe and prolong the life of the tires.
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07-19-2019, 09:59 AM	#2
tntp Private First Class 39 Rep 110 Posts Drives: 2015 X5S35i Join Date: Apr 2016 Location: NC iTrader: (0)	I got my non-runflats at Costco and they put 33 for Front and 36 for rear with Michelin. My old door sticker says 32/39. The door sticker is for runflats only. You will initially feel the ride is softer with non-runflats, so increase the PSI a bit, then gradually reduce the PSI to your comfort. Also inspect the tire wear when you get 2-3k miles on it and making adjustment accordingly, then rotate the tire every 10k or year. if you are OCD, go with 5k!
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07-19-2019, 10:10 AM	#3
Violator Living the dream 4588 Rep 2,194 Posts Drives: X5 w/MPPK, MPE & RC GTS Black Join Date: Dec 2014 Location: The Lone Star State iTrader: (2)	Owner’s Manual...read it Here is what BMW says...good luck Attached Images __________________ My Mod Thread
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07-19-2019, 03:18 PM	#5
alphaod Mmmmm… 1152 Rep 2,426 Posts Drives: F15 Join Date: Oct 2011 Location: New York iTrader: (0) Garage List 2015 BMW X5 xDrive50i [10.00]	Non-runflat tire pressure and runflat tire pressures are the same for me. __________________ 2015 BMW X5 xDrive50i BMW CCA 509766
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07-19-2019, 04:59 PM	#6
ems328i Second Lieutenant 180 Rep 289 Posts Drives: '14 35i (F15) '14 M135i (F21) Join Date: Feb 2019 Location: The Netherlands iTrader: (0)	I think it's personal preference, I tend to run slightly higher psi than the BMW manual states for a non-staggered 20" setup, just because it handles better in the turns (for me). I run 42 psi all round with just me, but I will bump it up for family vacations whe the car is fully loaded. YMMV __________________ 2014 X5 35i Sophistograu A90 (Dark Graphite) Terra Dakota Eibach Pro Kit & Lowering Links, RC GTS Black 2014 M135i 3dr
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Tire pressure for non-run flat tires (2015 F15 X5)

07-19-2019, 08:48 PM	#7
duercos Lieutenant 201 Rep 413 Posts Drives: F36>F16>G30 Join Date: Oct 2016 Location: Hillsborough, NJ iTrader: (0)	Do you guys go by your cold tire pressure or the hottest it gets on highways on a hot day?
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07-20-2019, 06:26 AM	#8
Road Carnage Private First Class 87 Rep 134 Posts Drives: 96 328is, 15 X5 50i Join Date: Oct 2018 Location: Bucks County, PA iTrader: (0)	Always check and adjust tire pressures cold. __________________ That’ll buff out
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07-20-2019, 02:11 PM	#11
F15GorDe Well versed in the care and feeding of BMWs 261 Rep 733 Posts Drives: F15d, F10 Join Date: Sep 2014 Location: NorCal iTrader: (0)	You know that your inflation pressures are close to correct for your application when the difference between cold/hot pressures yields a difference of less than 10% between the two at normal cruising speeds. Aggressive driving and heavy braking will add to the temperature and will bump up your reading. The pressures on the door frame label are excellent initial starting points for the majority of drivers and will satisfy most everyone. But, be honest with yourself, are you checking tire pressures monthly? __________________ B&O, parking assistant, executive package, 3rd row seats and the manual rear shades are the ONLY items we didn't order. Having everything else makes our F15d a NICE ride.
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07-20-2019, 04:43 PM	#12
ComasF15 Private First Class 54 Rep 174 Posts Drives: Silver Join Date: Jan 2019 Location: Emerald Coast iTrader: (0)	Tire pressure is a engineered number between the tire manufacturer and vehicle manufacturer. The correct pressure is designed to bring the tire to the correct operating temperature.
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11-25-2019, 07:05 PM	#13
KingBiscuit KingBiscuit 4 Rep 33 Posts Drives: '15 BMW X5x35i/'14 Lexus EX350 Join Date: Nov 2019 Location: Mississippi iTrader: (0)	If it's possible I think I'm more confused... And this is for run-flat... right? __________________ 2014 X5 xDrive 35i Last edited by KingBiscuit; 11-25-2019 at 07:11 PM..
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11-25-2019, 08:33 PM	#15
Picasso Private 37 Rep 97 Posts Drives: X5 50i Join Date: Nov 2019 Location: Ontario iTrader: (0)	Stick to what Violator posted in owners manual: 33/41 in your case
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11-26-2019, 12:48 PM	#19
JamesInSJ Private First Class 27 Rep 112 Posts Drives: E46 M3 Join Date: Mar 2019 Location: California iTrader: (0)	IIRC tire pressure recommendations are at ~70 degrees F. Drop about 1 psi for every 10 degrees F colder, and add 1 psi for every 10 degrees F warmer. Also noteworthy is if your car is parked outside, are the tires on one side exposed to sunlight or not. I've had tires on the sunny side measure ~2 psi higher just being in direct sunlight after they were set to the same pressure in the garage just a day or two prior. Surface temperatures measured with a laser thermometer confirmed a 20-25 degree difference, so after an hour+ of direct sunlight warming up one side you can get these wide differences.
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