tyre pressures

Dom · 01-13-2011, 05:33 AM

I checked my tyre pressure this am and found that they had 38psi all round. I think they should have 2.0bar at front and 2.3bar at rear. Which I reckon is about 29psi and 34psi. Am I right on this? I have the 328 style wheels with 245/45/18 tyres.

LuvMyE92 · 01-13-2011, 06:50 AM

Not sure about Ireland, but over here the government requires manufacturers to put a sticker on the driver's door jamb with recommended pressures. Typically I find the BMW recommended pressures to be too high, but 29/34 sounds a little low (the 29 seems low). I usually run 32 all around, just because it works well for me and is high enough to keep the TLPWS from going off (I think it goes off at 27 psi).

joy5 · 01-13-2011, 07:25 AM

Check your doorsill, it should have the correct pressure for different wheel sizes if not refer to the User Manual

JOHNBMWM5 · 01-13-2011, 09:52 AM

I will run 36 PSI all round, it worked well on the M3 2010, so I will do the same with the 550i M sport.

smanoj77 · 01-13-2011, 10:14 AM

Quote:

Originally Posted by Dom

I checked my tyre pressure this am and found that they had 38psi all round. I think they should have 2.0bar at front and 2.3bar at rear. Which I reckon is about 29psi and 34psi. Am I right on this? I have the 328 style wheels with 245/45/18 tyres.

I have the same tyre as yours. According to the tag on the door sill, what you've written is accurate. I've been running my tyres at the above pressures.

grimlock · 01-13-2011, 11:22 AM

depends alot on your rim+tire spec, the lower profile the tire, the higher PSI u need.. also the higher your average load the higher PSI
i dont follow the recommended settings as they are generalized.. you get a better idea through feel of driving it and visual inspection
im at 31.2/ 33 on 19's 8-225/45 9-255/40 summer non-RF, low average load
you save gas at higher PSI but itll be a little bumpier also

rexus300 · 01-15-2011, 10:08 AM

LUVMy92,

Did you feel that running the pressure at 32/32 affect handling and ride comfort at all? I feel that my pressure of 35/35 all around is too high especially feeling irregularities from the highway in the rear of the car at 70-80 mph. I decreased it to 34/33 F/R last night and will try it today. I have the size 245/45/18 wheels with Continental SSR all season RFT on my 535 xdrive.

01-13-2011, 05:33 AM	#1
Dom Private First Class 44 Rep 134 Posts Drives: 2013 520d SE space grey Join Date: Sep 2010 Location: Co.Donegal, Ireland iTrader: (0)	tyre pressures I checked my tyre pressure this am and found that they had 38psi all round. I think they should have 2.0bar at front and 2.3bar at rear. Which I reckon is about 29psi and 34psi. Am I right on this? I have the 328 style wheels with 245/45/18 tyres.
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01-13-2011, 06:50 AM	#2
LuvMyE92 Occasionally frequent poster 3000 Rep 2,744 Posts Drives: CT5V-Blackwing Join Date: Jan 2008 Location: RTP NC, USA iTrader: (0)	Not sure about Ireland, but over here the government requires manufacturers to put a sticker on the driver's door jamb with recommended pressures. Typically I find the BMW recommended pressures to be too high, but 29/34 sounds a little low (the 29 seems low). I usually run 32 all around, just because it works well for me and is high enough to keep the TLPWS from going off (I think it goes off at 27 psi). __________________ Current inventory: F22 & G05 Cadillac CT5-V Blackwing w/3 pedals Past: E24,E28(3),E34,E36,E37,E38(2),E39(4),E46,E89,E92 (obviously),F01,F06,F10,F30,F87,G12,G30(2),G82(2)
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01-13-2011, 07:25 AM	#3
joy5 Private First Class 20 Rep 186 Posts Drives: xDrive30d M Sport Join Date: Jul 2010 Location: Scotland iTrader: (0)	Check your doorsill, it should have the correct pressure for different wheel sizes if not refer to the User Manual __________________ 2013 - x30d E70 M Sport 2010 - 520d F10 SE
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01-13-2011, 09:52 AM	#4
JOHNBMWM5 Live for today tomorrow never comes 1989 Rep 9,498 Posts Drives: 2022 LCI Marina Bay Blue/ Smok Join Date: Jan 2008 Location: UK iTrader: (0)	I will run 36 PSI all round, it worked well on the M3 2010, so I will do the same with the 550i M sport. __________________ Live for now, life is too short. 2021 LCI M5 Marina Bay Blue/ Smoked White Leather
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01-13-2011, 11:22 AM	#6
grimlock Colonel 716 Rep 2,003 Posts Drives: F10 N52B30@255PS Join Date: Sep 2010 Location: Hong Kong iTrader: (0)	depends alot on your rim+tire spec, the lower profile the tire, the higher PSI u need.. also the higher your average load the higher PSI i dont follow the recommended settings as they are generalized.. you get a better idea through feel of driving it and visual inspection im at 31.2/ 33 on 19's 8-225/45 9-255/40 summer non-RF, low average load you save gas at higher PSI but itll be a little bumpier also
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01-15-2011, 10:08 AM	#7
rexus300 Lieutenant 154 Rep 440 Posts Drives: car Join Date: Jan 2010 Location: Bloomfield Hills, Michigan iTrader: (1)	LUVMy92, Did you feel that running the pressure at 32/32 affect handling and ride comfort at all? I feel that my pressure of 35/35 all around is too high especially feeling irregularities from the highway in the rear of the car at 70-80 mph. I decreased it to 34/33 F/R last night and will try it today. I have the size 245/45/18 wheels with Continental SSR all season RFT on my 535 xdrive.
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