F25 X3 Tyre pressures query

Dazvanman · 08-02-2023, 03:59 PM

Hi all,

I need advice please re: tyre pressures. On a couple of occasions when collecting my car from my local BMW main dealer, I noticed that they deflated my tyre pressures, more so the rear ones. I also took my car to my local Independent Specialist the other day for a quotation on brake replacement works and the gentleman there also said that my tyre pressures seem too high!

How do you guys read this decal which is stamped on the inside of the drivers car door? Photo attached.

Just me and the wife normally, so a load of two people.

My rubber is -

Front - 245x40xR20 99Y Pirelli P-Zero.
Rear - 275x35xR20 102Y Pirelli P-Zero.

Thanks for reading! Name: IMG_5390.jpg
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Name: IMG_5390.jpg
Views: 556
Size: 150.1 KB

Wgosma · 08-02-2023, 07:49 PM

The chart is telling you the recommended tire pressure for car fitted with a given tire/wheel size and load (number of passengers) in the vehicle.

Example: look at the upper LEFT quadrant- it lists one tire size:

- 245/55 R17 (17" wheel diameter)

- recommended inflation for vehicle with that wheel/tire and a load = 3 passengers should be both Front and Rear tires at 2,4 Bar (which is also 35 psi)

- Same wheel/tire with 5 passenger load: tire inflation is 2,4 Bar Fronts / 2,5 Bar rears.

Tire pressures should be measured with 'cold' tires; i.e. before being driven any significant distance (which generates heat and causes tire pressure to rise)

slowblackx3f25 · 08-02-2023, 08:42 PM

ALWAYS check tire pressure when engine is cold during cold start, good to check in the early morning.

Pneking · 08-03-2023, 12:00 AM

Can I ask what pressure they set it to? I have same tyres and have been asking the same question!

Qsilver7 · 08-03-2023, 05:46 AM

Quote:

Originally Posted by Dazvanman

Hi all,

How do you guys read this decal which is stamped on the inside of the drivers car door? Photo attached.

Just me and the wife normally, so a load of two people.

My rubber is -

Front - 245x40xR20 99Y Pirelli P-Zero.
Rear - 275x35xR20 102Y Pirelli P-Zero.

Red is what is recommended for the front (based on the tire specs & number of people)

2.2 bar or 32 PSI (depending on gauge being used)

Green is what is recommended for the rear (based on the specs you gave):

2.8 bar or 41 PSI (depending on gauge being used)

08-02-2023, 03:59 PM	#1
Dazvanman Registered 0 Rep 4 Posts Drives: BMW F25 X3 Join Date: Nov 2021 Location: Staffordshire iTrader: (0)	F25 X3 Tyre pressures query Hi all, I need advice please re: tyre pressures. On a couple of occasions when collecting my car from my local BMW main dealer, I noticed that they deflated my tyre pressures, more so the rear ones. I also took my car to my local Independent Specialist the other day for a quotation on brake replacement works and the gentleman there also said that my tyre pressures seem too high! How do you guys read this decal which is stamped on the inside of the drivers car door? Photo attached. Just me and the wife normally, so a load of two people. My rubber is - Front - 245x40xR20 99Y Pirelli P-Zero. Rear - 275x35xR20 102Y Pirelli P-Zero. Thanks for reading!
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08-02-2023, 07:49 PM	#2
Wgosma Lieutenant Colonel 806 Rep 1,906 Posts Drives: 2012 F25 X3 28i (N52) Join Date: Sep 2018 Location: Northern Nevada iTrader: (0)	The chart is telling you the recommended tire pressure for car fitted with a given tire/wheel size and load (number of passengers) in the vehicle. Example: look at the upper LEFT quadrant- it lists one tire size: - 245/55 R17 (17" wheel diameter) - recommended inflation for vehicle with that wheel/tire and a load = 3 passengers should be both Front and Rear tires at 2,4 Bar (which is also 35 psi) - Same wheel/tire with 5 passenger load: tire inflation is 2,4 Bar Fronts / 2,5 Bar rears. Tire pressures should be measured with 'cold' tires; i.e. before being driven any significant distance (which generates heat and causes tire pressure to rise)
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08-02-2023, 08:42 PM	#3
slowblackx3f25 xdriv33 69 Rep 218 Posts Drives: 17' BMW x3 F25 xDrive28i xLine Join Date: Aug 2019 Location: Toronto, Ontario, Canada iTrader: (0) Garage List 2017 BMW x3 [0.00]	ALWAYS check tire pressure when engine is cold during cold start, good to check in the early morning. __________________ BLACK 2017 BMW x3 xDrive28i [N20] xLine Package, Comfort Access, Build Date: 03/03/2017. [THE POWER OF 33]
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08-03-2023, 12:00 AM	#4
Pneking New Member 8 Rep 5 Posts Drives: BMW x3 30d f25 Join Date: Aug 2023 Location: Preston iTrader: (0) Garage List 2017 bmw x3 30d [8.00]	Can I ask what pressure they set it to? I have same tyres and have been asking the same question!
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