Tire pressure issue

spx1 · 12-05-2009, 06:52 AM

I have the standard

Front R18 225/40
Rear R18 255/35

As you can see, the recommended tire pressure for the rear is 310Kpa, is it a bit too high, if so what is your usual tire pressure? Thank you!!

DrJason · 12-05-2009, 08:34 AM

Quote:

Originally Posted by spx1

I have the standard

Front R18 225/40
Rear R18 255/35

As you can see, the recommended tire pressure for the rear is 310Kpa, is it a bit too high, if so what is your usual tire pressure? Thank you!!

I don't understand your question. The recommended pressure IS the pressure you should use.

mrboon · 12-05-2009, 09:09 AM

just use what they recommend, should be perfect.

Stick Shift · 12-05-2009, 11:02 AM

I have the same size tires and the recommended pressure for my 255/35 R18 rear tires is 42 PSI which equals 290 Kpa. I don't know why BMW would recommend different tire pressure in U.S. than in Australia. Maybe they are different tires. Mine are Bridgestone Potenza RE050A I Run-Flats.

Unless you are taking the car on the track your best bet is to use the recommend tire pressure.

MilitaryE89 · 12-05-2009, 11:48 AM

is it recommended or maximum?

Memphis1 · 12-05-2009, 12:01 PM

the psi on the sticker is the maximum... it depends on the load and on the speed.

ChuckB · 12-05-2009, 01:35 PM

Quote:

Originally Posted by spx1

I have the standard

Front R18 225/40
Rear R18 255/35

As you can see, the recommended tire pressure for the rear is 310Kpa, is it a bit too high, if so what is your usual tire pressure? Thank you!!

spx1 - Not sure why the differences, but here is what is on my German spec sDrive3.0 with Adaptive Suspension, built in July 2009

Memphis1 · 12-05-2009, 01:42 PM

that's funny, the stickers look different...

MilitaryE89 · 12-05-2009, 03:37 PM

i know that the max pressure is printed on the tire and a lot of people mistake this for the recommended pressure...however, i can't imagine BMW would give a sticker with the max pressure as opposed to what they consider normal operating pressure...i'd say stick to your sticker (yeah, i did that on purpose...) and your manual. And then if you have catastrophic tire failure that you happen to live through, you can sue BMW because you followed their guidelines...

Memphis1 · 12-05-2009, 08:12 PM

Quote:

Originally Posted by spx1

I have the standard

Front R18 225/40
Rear R18 255/35

As you can see, the recommended tire pressure for the rear is 310Kpa, is it a bit too high, if so what is your usual tire pressure? Thank you!!

is it possible for someone else from australia to check their sticker?? his numbers are for driving faster than 100mph...

Mr. ///M3 RD · 06-14-2010, 07:57 PM

Thanks everyone! I use the BMW name plate data (on driver side)

Front 225/35/R19 XL ... 250 KPA / 36 PSI
Rear 255/30/19R XL ... 290 KPA / 42 PSI

Thanks again!

mcbeee · 06-14-2010, 08:21 PM

I checked my stickers (yes there are two, a yellow one has the +100mph data.) and it's 42 up to 100 mph and 44 over 100 mph on the rears (19"). 36 on the fronts at all speeds.

Canadian model, shouldn't be any different than a US or Aussie etc.

ChuckB · 06-14-2010, 11:58 PM

Quote:

Originally Posted by solgain@mac.com

Thanks everyone! I use the BMW name plate data (on driver side)

Front 225/35/R19 XL ... 250 KPA / 36 PSI
Rear 255/30/19R XL ... 290 KPA / 42 PSI

Thanks again!

Same size tires but sticker [above] says 230/280 kPa [33/41psi], and I think the legal speeds are a bit higher here, kinda doesn't make sense

Mr. ///M3 RD · 06-15-2010, 01:38 PM

Chuck, yes our maximum here is 110 KM / Hour .... mind you when I overtake I get her up to 160 KM (or when the police have a coffee and or lunch break ~grin~).

I do have fun on the Autobahn every 3 years or so

was there last year it was great.

JMcDon1007 · 06-15-2010, 06:42 PM

I wonder why the rec. Tire pressure is more for the back tires than the front? Is it because the car is rwd? I keep mine at the rec. Pressures, but I remember a long time ago that people would put less pressure in the rear tires to help the car ride better. Does anyone still do that??

Mr. ///M3 RD · 06-15-2010, 07:29 PM

Quote:

Originally Posted by JMcDon1007

I wonder why the rec. Tire pressure is more for the back tires than the front? Is it because the car is rwd? I keep mine at the rec. Pressures, but I remember a long time ago that people would put less pressure in the rear tires to help the car ride better. Does anyone still do that??

JMcDon, Go to this link it will explain it.

http://www.e90post.com/forums/showthread.php?t=299756

12-05-2009, 06:52 AM	#1
spx1 Registered 4 Rep 4 Posts Drives: E89 S35i Join Date: Nov 2006 Location: Sydney iTrader: (0) Garage List 2006 E90 320i [0.00]	Tire pressure issue I have the standard Front R18 225/40 Rear R18 255/35 As you can see, the recommended tire pressure for the rear is 310Kpa, is it a bit too high, if so what is your usual tire pressure? Thank you!! Attached Images
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12-05-2009, 09:09 AM	#3
mrboon Lieutenant 76 Rep 561 Posts Drives: Speeeed Join Date: Oct 2009 Location: *** iTrader: (0)	just use what they recommend, should be perfect.
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12-05-2009, 11:02 AM	#4
Stick Shift Private 2 Rep 63 Posts Drives: too fast Join Date: Oct 2009 Location: Maryland, USA iTrader: (0)	I have the same size tires and the recommended pressure for my 255/35 R18 rear tires is 42 PSI which equals 290 Kpa. I don't know why BMW would recommend different tire pressure in U.S. than in Australia. Maybe they are different tires. Mine are Bridgestone Potenza RE050A I Run-Flats. Unless you are taking the car on the track your best bet is to use the recommend tire pressure. __________________ 2008 Porsche Carrera S 2010 BMW Z4 35i
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12-05-2009, 11:48 AM	#5
MilitaryE89 Private First Class 8 Rep 188 Posts Drives: 2008 328i, 2009 sDrive30i Join Date: May 2009 Location: APO, AE iTrader: (0)	is it recommended or maximum?
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12-05-2009, 12:01 PM	#6
Memphis1 Lieutenant Colonel 91 Rep 1,838 Posts Drives: Z4 SDrive 35i Join Date: Oct 2009 Location: CT iTrader: (0)	the psi on the sticker is the maximum... it depends on the load and on the speed. __________________ Last edited by Memphis1; 02-18-2011 at 10:16 PM..
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12-05-2009, 01:42 PM	#8
Memphis1 Lieutenant Colonel 91 Rep 1,838 Posts Drives: Z4 SDrive 35i Join Date: Oct 2009 Location: CT iTrader: (0)	that's funny, the stickers look different... __________________
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12-05-2009, 03:37 PM	#9
MilitaryE89 Private First Class 8 Rep 188 Posts Drives: 2008 328i, 2009 sDrive30i Join Date: May 2009 Location: APO, AE iTrader: (0)	i know that the max pressure is printed on the tire and a lot of people mistake this for the recommended pressure...however, i can't imagine BMW would give a sticker with the max pressure as opposed to what they consider normal operating pressure...i'd say stick to your sticker (yeah, i did that on purpose...) and your manual. And then if you have catastrophic tire failure that you happen to live through, you can sue BMW because you followed their guidelines...
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06-14-2010, 07:57 PM	#11
Mr. ///M3 RD Happy Camper 613 Rep 7,869 Posts Drives: C63 AMG & 280 SL on Weekends : Join Date: May 2010 Location: GTA, Ontario - Canada iTrader: (0) Garage List 1969 Restored Merce ... [7.50] 2011 M3 Coupe TRADED [7.34] 1987 BMW 535is [1.00] Cars from the Past [6.50] The ///M3 Engine S65 [9.59]	Thanks everyone! I use the BMW name plate data (on driver side) Front 225/35/R19 XL ... 250 KPA / 36 PSI Rear 255/30/19R XL ... 290 KPA / 42 PSI Thanks again! __________________ Cheers, Rolf-Dieter Life will take us to some interesting places, fortunately The ///M3 will too with a many of us know this very well, now my C6.3 AMG with 487 HP does it too ---> Click here for some good stuff I found
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06-14-2010, 08:21 PM	#12
mcbeee Lieutenant 5 Rep 446 Posts Drives: '09 Z4 s35i & '03 Z4 3.0i Join Date: Nov 2009 Location: Calgary iTrader: (0) Garage List 2003 Z4 3.0i [5.00] 2001 Z3 3.0i [0.00] 2009 Z4 s35i [7.00]	I checked my stickers (yes there are two, a yellow one has the +100mph data.) and it's 42 up to 100 mph and 44 over 100 mph on the rears (19"). 36 on the fronts at all speeds. Canadian model, shouldn't be any different than a US or Aussie etc. __________________ Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps '03 Z4 3.0i Sterling Grey (Hers) '01 Z3 3.0i Sapphire Black, M sport package (Mine)
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06-15-2010, 01:38 PM	#14
Mr. ///M3 RD Happy Camper 613 Rep 7,869 Posts Drives: C63 AMG & 280 SL on Weekends : Join Date: May 2010 Location: GTA, Ontario - Canada iTrader: (0) Garage List 1969 Restored Merce ... [7.50] 2011 M3 Coupe TRADED [7.34] 1987 BMW 535is [1.00] Cars from the Past [6.50] The ///M3 Engine S65 [9.59]	Chuck, yes our maximum here is 110 KM / Hour .... mind you when I overtake I get her up to 160 KM (or when the police have a coffee and or lunch break ~grin~). I do have fun on the Autobahn every 3 years or so was there last year it was great. __________________ Cheers, Rolf-Dieter Life will take us to some interesting places, fortunately The ///M3 will too with a many of us know this very well, now my C6.3 AMG with 487 HP does it too ---> Click here for some good stuff I found
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06-15-2010, 06:42 PM	#15
JMcDon1007 Speed Freak 6 Rep 28 Posts Drives: 2010 Z4 sDrive35i - BSM Join Date: Jun 2010 Location: Cornelius, NC iTrader: (0)	I wonder why the rec. Tire pressure is more for the back tires than the front? Is it because the car is rwd? I keep mine at the rec. Pressures, but I remember a long time ago that people would put less pressure in the rear tires to help the car ride better. Does anyone still do that??
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