F10 (2014) 535i xdrive tire pressure

joemulder · 03-12-2017, 08:05 PM

hi all,

I found out today that one of my tire valve stem caps was stolen..

when I get home, I checked the tire pressure , I realized all 4 tires are low.

I was about to refill the tire, but on the user guide. it says

"The displays of inflation devices may under-read by up to 1.45 psi/0.1 bar"

I was just wondering should I refill the tire to 35psi(front) 39psi(rear) minus 1.45 PSI?

Thanks!!

also , what does OEM tire air valve stem cap looks like?
Mine has N2 written on the top, black cap. plastic.

lsturbointeg · 03-12-2017, 10:39 PM

first, what PSI are you currently reading?

joemulder · 03-13-2017, 07:44 AM

Quote:

Originally Posted by lsturbointeg

first, what PSI are you currently reading?

32.4 32.5 (front)
33.1 33.4 (rear)

Gilgorm · 03-13-2017, 02:03 PM

Your tires are likely low due to the cold temperatures today.

Fill the tires to the manual / door jamb sticker recommendations and check them with a good quality tire gauge that every car owner should have.
If possible they should be filled when still cold. I have a small compressor that I use in my driveway so the tires are always stone cold.
You should check your tires every month or before a long trip. I'm lax myself in this regard plus its damn cold out.
The 1.45 reading seems like a red herring to me--how do you know which inflating device is inaccurate? Use your own gauge.
I would rather fill up the tires using my gauge (if on a trip), drive home and let the tires cool down and then check them with my own gauge again for the best accuracy. A small variance to the upside is probably better than a variance to the downside when it comes to pressure.
35/36 fronts and 39 rears sounds right.
You'll need to re-check the tires once the weather warms up in the spring (if it ever arrives).

lsturbointeg · 03-13-2017, 03:05 PM

Very common issue here as several members including myself

03-12-2017, 08:05 PM	#1
joemulder Private 13 Rep 76 Posts Drives: bmw 535xi Join Date: Dec 2016 Location: toronto iTrader: (0)	F10 (2014) 535i xdrive tire pressure hi all, I found out today that one of my tire valve stem caps was stolen.. when I get home, I checked the tire pressure , I realized all 4 tires are low. I was about to refill the tire, but on the user guide. it says "The displays of inflation devices may under-read by up to 1.45 psi/0.1 bar" I was just wondering should I refill the tire to 35psi(front) 39psi(rear) minus 1.45 PSI? Thanks!! also , what does OEM tire air valve stem cap looks like? Mine has N2 written on the top, black cap. plastic. __________________ I am new here. Thank you for your help!!! Last edited by joemulder; 03-12-2017 at 08:21 PM..
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03-12-2017, 10:39 PM	#2
lsturbointeg Lieutenant General 9153 Rep 14,522 Posts Drives: 2011 535i Jet Black Join Date: Aug 2014 Location: Asian lost in OH iTrader: (0)	first, what PSI are you currently reading? __________________ ~F90Conversion~21"3Piece Forged AvantGardeWheels~KWV1Coilovers~CQUENCE slotted/drilled rotors~GoodridgeStainlesslines~MeisterschaftQuadEx haust~Akrapovic 4"tips~VRSF DP~VRSF CP~TurboSmart BOV~K&N filter~CarbonFiberExteriorComponents~GladenAlphaCo mponents~MatchUp7BMW~Punch P300-12T~ Follow me on Instagram: lsturbointeg
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03-13-2017, 02:03 PM	#4
Gilgorm Second Lieutenant 24 Rep 237 Posts Drives: 2018 640i Xdrive GT Join Date: Jul 2012 Location: Toronto, Canada iTrader: (0)	Your tires are likely low due to the cold temperatures today. Fill the tires to the manual / door jamb sticker recommendations and check them with a good quality tire gauge that every car owner should have. If possible they should be filled when still cold. I have a small compressor that I use in my driveway so the tires are always stone cold. You should check your tires every month or before a long trip. I'm lax myself in this regard plus its damn cold out. The 1.45 reading seems like a red herring to me--how do you know which inflating device is inaccurate? Use your own gauge. I would rather fill up the tires using my gauge (if on a trip), drive home and let the tires cool down and then check them with my own gauge again for the best accuracy. A small variance to the upside is probably better than a variance to the downside when it comes to pressure. 35/36 fronts and 39 rears sounds right. You'll need to re-check the tires once the weather warms up in the spring (if it ever arrives). __________________ 2018 640ix GT; Alpine White, Blk Nappa, Piano; M-sport, Premium (Ceramic, SIRIUS, Soft-close, Vent/Massage Comfort seats, Surround, Sunshades, Parking Ass't), Advanced Driver Ass't (Lane keep, Steering/Lane control, Cross traffic, ACC with Stop/Go), Smartphone, Tint. Retired: 78 300D, 81 300SD, 87 190E, 88 Porsche 924, 89 260E, 93 300E, 97 Volvo 850, 98 E320, 03 BMW 325iT, 02 C230 Sport Coupe, 08 BMW 535i, 12 BMW 535i X-drive
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03-13-2017, 03:05 PM	#5
lsturbointeg Lieutenant General 9153 Rep 14,522 Posts Drives: 2011 535i Jet Black Join Date: Aug 2014 Location: Asian lost in OH iTrader: (0)	Very common issue here as several members including myself __________________ ~F90Conversion~21"3Piece Forged AvantGardeWheels~KWV1Coilovers~CQUENCE slotted/drilled rotors~GoodridgeStainlesslines~MeisterschaftQuadEx haust~Akrapovic 4"tips~VRSF DP~VRSF CP~TurboSmart BOV~K&N filter~CarbonFiberExteriorComponents~GladenAlphaCo mponents~MatchUp7BMW~Punch P300-12T~ Follow me on Instagram: lsturbointeg
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