Help wanted with tyre pressures

Adespin99 · 08-26-2016, 02:35 PM

Hi,
I have a 2014 f30 m sport 320d.
It has Pirelli P7 run flats fitted
225/45 r18 on the front
255/40 r18 on the rear

Could someone please tell me the pressures they should be running on.

Many thanks
Ade

Kiddy1 · 08-26-2016, 02:53 PM

Ade, check on the inside of the drivers door sill.

Adespin99 · 08-26-2016, 02:55 PM

I have and it doesn't seem to make sense lol

Gabreigns · 08-26-2016, 03:06 PM

What does it show? Post a picture of you car's heiroglyphics on the door.

Adespin99 · 08-26-2016, 04:02 PM

Just added picture

Gabreigns · 08-26-2016, 04:08 PM

Got it! Is your car an x drive?

Rich9600 · 08-26-2016, 04:11 PM

Looks like they are on the right side of the image.

Fronts in top right quadrant, 2.0 Bar normal load.

Rears in bottom right quadrant, 2.2 Bar normal load.

Adespin99 · 08-26-2016, 04:15 PM

Thanks, your figures are what I thought but I was confused as I expected the tyre sizes to be in the same quadrant. Does that make sense?

teaston · 08-26-2016, 06:26 PM

Quote:

Originally Posted by Adespin99

Thanks, your figures are what I thought but I was confused as I expected the tyre sizes to be in the same quadrant. Does that make sense?

They'd only be in the same quadrant if they used the same pressures!

Adespin99 · 08-27-2016, 02:11 AM

They are staggered, different tyre sizes front and back, so they wouldn't necessarily have the same pressures but the chart would be easier to read.

HighlandPete · 08-27-2016, 04:03 AM

Quote:

Originally Posted by Adespin99

They are staggered, different tyre sizes front and back, so they wouldn't necessarily have the same pressures but the chart would be easier to read.

I've read other comments saying it could be easier to read, but wheel combinations are pretty wide on a BMW, so not too easy to list a different way.

It is easy to read if you if you simply apply the logic of looking for the wheel/tyre you have fitted, (front or rear) and look on the chart to see where it is listed, read the pressure recommendation. It's no more complex than that.

teaston · 08-27-2016, 04:20 AM

Those pressures seem very low though, especially 2.0 bar!

Personally I'd set them to half way between the small load and large load figures, so 2.3 front & 2.5 rear.

Adespin99 · 08-27-2016, 04:30 AM

Thanks for everyone's help. I think I will run them on 2.3 front and 2.5 rear as I agree 2.0 bar seems very low.

08-26-2016, 02:35 PM	#1
Adespin99 New Member 1 Rep 20 Posts Drives: X3 Join Date: Jan 2014 Location: South Wales, UK iTrader: (0)	Help wanted with tyre pressures Hi, I have a 2014 f30 m sport 320d. It has Pirelli P7 run flats fitted 225/45 r18 on the front 255/40 r18 on the rear Could someone please tell me the pressures they should be running on. Many thanks Ade Attached Images Last edited by Adespin99; 08-26-2016 at 04:02 PM..
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08-26-2016, 02:53 PM	#2
Kiddy1 Second Lieutenant 78 Rep 235 Posts Drives: F30 330d M-Sport Join Date: May 2016 Location: Newcastle upon Tyne iTrader: (0)	Ade, check on the inside of the drivers door sill.
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08-26-2016, 02:55 PM	#3
Adespin99 New Member 1 Rep 20 Posts Drives: X3 Join Date: Jan 2014 Location: South Wales, UK iTrader: (0)	I have and it doesn't seem to make sense lol
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08-26-2016, 03:06 PM	#4
Gabreigns Major 494 Rep 1,076 Posts Drives: F3x Join Date: Jul 2015 Location: USA iTrader: (0)	What does it show? Post a picture of you car's heiroglyphics on the door.
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08-26-2016, 04:02 PM	#5
Adespin99 New Member 1 Rep 20 Posts Drives: X3 Join Date: Jan 2014 Location: South Wales, UK iTrader: (0)	Just added picture
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08-26-2016, 04:08 PM	#6
Gabreigns Major 494 Rep 1,076 Posts Drives: F3x Join Date: Jul 2015 Location: USA iTrader: (0)	Got it! Is your car an x drive?
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08-26-2016, 04:11 PM	#7
Rich9600 Colonel 741 Rep 2,511 Posts Drives: i4 M50 Join Date: Nov 2013 Location: UK iTrader: (0)	Looks like they are on the right side of the image. Fronts in top right quadrant, 2.0 Bar normal load. Rears in bottom right quadrant, 2.2 Bar normal load. __________________ Driving i4 M50 (G26) Previous 340i Touring MSport (F31)
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08-26-2016, 04:15 PM	#8
Adespin99 New Member 1 Rep 20 Posts Drives: X3 Join Date: Jan 2014 Location: South Wales, UK iTrader: (0)	Thanks, your figures are what I thought but I was confused as I expected the tyre sizes to be in the same quadrant. Does that make sense?
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08-27-2016, 02:11 AM	#10
Adespin99 New Member 1 Rep 20 Posts Drives: X3 Join Date: Jan 2014 Location: South Wales, UK iTrader: (0)	They are staggered, different tyre sizes front and back, so they wouldn't necessarily have the same pressures but the chart would be easier to read. Last edited by Adespin99; 08-27-2016 at 02:16 AM..
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08-27-2016, 04:20 AM	#12
teaston Banned 10995 Rep 32,881 Posts Drives: X3 M40d Join Date: May 2012 Location: The High Seas iTrader: (1)	Those pressures seem very low though, especially 2.0 bar! Personally I'd set them to half way between the small load and large load figures, so 2.3 front & 2.5 rear.
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08-27-2016, 04:30 AM	#13
Adespin99 New Member 1 Rep 20 Posts Drives: X3 Join Date: Jan 2014 Location: South Wales, UK iTrader: (0)	Thanks for everyone's help. I think I will run them on 2.3 front and 2.5 rear as I agree 2.0 bar seems very low.
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