Ideal Tire Pressure - BMW 3-Series (E90 E92) Forum

natedogg · 04-06-2007, 12:58 AM

i tried doing a search but nothing popped up.

does anyone know the ideal tire pressure is for the 2006 325i
Type 161 (Front: 17x8 ET34 225/45 R17) (Rear: 17x8.5 ET37 255/40 R17)?

gos · 04-06-2007, 01:10 AM

Quote:

Originally Posted by natedogg

i tried doing a search but nothing popped up.

does anyone know the ideal tire pressure is for the 2006 325i
Type 161 (Front: 17x8 ET34 225/45 R17) (Rear: 17x8.5 ET37 255/40 R17)?

There will be a million answers, but generally "what you feel is right"... the door jam gives decent guidelines, I inflate my fronts a bit from there... I think I run like 36F/38R. If you want it a bit softer, that's fine too.

As you increase the F:R ratio, your car will generally oversteer more.
As you decrease the F:R ratio, your car will generally understeer more.

luckyguyinla · 04-06-2007, 01:12 AM

Quote:

Originally Posted by natedogg

i tried doing a search but nothing popped up.

does anyone know the ideal tire pressure is for the 2006 325i
Type 161 (Front: 17x8 ET34 225/45 R17) (Rear: 17x8.5 ET37 255/40 R17)?

look on your side of your driver side door. it should tell me information about the car n tire. n pressure of the tire should be

Vancouver E90 · 04-06-2007, 01:35 AM

I have a 2006 330i. Same question. I referred to the information on the door jam. Only thing is that I typically would have 2 people in the car at most, whereas the information on the door is based on max 4 occupancy.

AndrewAZ · 04-06-2007, 02:01 AM

Off the top of my head I am running 32 psi in the front and 39 psi in the rear which provides a nice balance of handling and fuel economy along with having the car set up with pressure to cruise at 100 mph+.

BoostedBMW · 04-06-2007, 11:20 AM

I usually run 34psi in all my tires.

txusa03 · 04-06-2007, 11:24 AM

should be moved to tire section where there are expert lurker waiting to answer like Gary.

MX20 · 04-10-2007, 04:48 PM

I was about to ask about the same but since I found this I'll just "attach" my interest to this thread instead.

Today I checked the pressure for the first time since I got the car and to my surprise it was 28F/32R (well actually 1.9bar/2.2bar

). Waaay below the figures on the inside of driver door....
Upped it to 2.2/2.6 (i.e. 32/38 in psi). Now the ride is harsher, of course. I am feeling now everything they did to patch the road this winter

I have (by intention) 205/55R16 (ER300 Turanza) because the roads are kind of bumpy over here. Mostly in-town riding, little to no highway for me.

Now should I trust the figures inside the door (and get the harder ride) or the dealer (but maybe risk premature wear)?

Fraggy · 04-11-2007, 09:46 PM

On my 161s with RFTs I was down to 31 all around. In the winter the tires were too stiff for anything higher. In the summer, I was around 33 all around.

MX20 · 04-12-2007, 03:56 AM

Quote:

Originally Posted by gos

As you increase the F:R ratio, your car will generally oversteer more.
As you decrease the F:R ratio, your car will generally understeer more.

Then I guess there's a sweet spot, definitely not "front equals rear". Even the inside-door label specifies higher rear pressure.

kujo · 04-12-2007, 08:59 AM

on non RFTs, it's 10% of the curb weight +1/2

I run 36psi in front and 37 in the rear.
I've always had great handling and also EXCELLENT tire wear.
I check the pressures every weekend and every other weekend usualy add .5-1 psi, depending on tempeture changes and what not.

kj

ahsan312 · 04-11-2008, 02:12 PM

So for my 325i running stock 16's with conti pro contact non run flats..should I run 32 in the front and 41 in the back??? Thanks I am newbie to this

04-06-2007, 12:58 AM	#1
natedogg Nate Drives: E90 Join Date: Jan 2007 Location: San Fran Posts: 172 iTrader: (0)	Ideal Tire Pressure i tried doing a search but nothing popped up. does anyone know the ideal tire pressure is for the 2006 325i Type 161 (Front: 17x8 ET34 225/45 R17) (Rear: 17x8.5 ET37 255/40 R17)? __________________ The less people speak of their greatness, the more we think of it.
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04-06-2007, 11:20 AM	#6
BoostedBMW Moderator Drives: TiAg E92 335 Join Date: Oct 2006 Location: Raleigh, NC Posts: 6,784 iTrader: (14) Garage List 2003 S2000 [0.00]	I usually run 34psi in all my tires. __________________ -Michael. Berlina Black S2000 CR is now in the garage l 19" Rial Daytona Race l KW V2 l Eisenhaus Race Exhaust l

04-06-2007, 11:24 AM	#7
txusa03 Major General Drives: TS330iPPSP6MT Join Date: Jul 2005 Location: Planet Earth Posts: 6,569 iTrader: (2)	should be moved to tire section where there are expert lurker waiting to answer like Gary. __________________ under construction!

04-10-2007, 04:48 PM	#8
MX20 \oo==0\|0==oo/ Drives: 320d Join Date: Mar 2007 Location: Europe, Romania Posts: 102 iTrader: (0)	I was about to ask about the same but since I found this I'll just "attach" my interest to this thread instead. Today I checked the pressure for the first time since I got the car and to my surprise it was 28F/32R (well actually 1.9bar/2.2bar ). Waaay below the figures on the inside of driver door.... Upped it to 2.2/2.6 (i.e. 32/38 in psi). Now the ride is harsher, of course. I am feeling now everything they did to patch the road this winter I have (by intention) 205/55R16 (ER300 Turanza) because the roads are kind of bumpy over here. Mostly in-town riding, little to no highway for me. Now should I trust the figures inside the door (and get the harder ride) or the dealer (but maybe risk premature wear)? __________________ "...ssssix blade knife, do anything fo' ya'..."

04-11-2007, 09:46 PM	#9
Fraggy Brigadier General Drives: 2007 e90 Join Date: Jun 2005 Location: San Diego Posts: 3,235 iTrader: (11)	On my 161s with RFTs I was down to 31 all around. In the winter the tires were too stiff for anything higher. In the summer, I was around 33 all around. __________________ Step--Premium--Sport--Nav--20% Tint--Blacklines--18" Beyern Mesh--Michelin Super Sports--Bastuck Exhaust--M3 Steering Wheel--BMW Performance Springs--Koni--M3 Front/Rear Sways--

04-06-2007, 01:35 AM	#4
Vancouver E90 New Member Drives: BMW 330i Join Date: Sep 2006 Location: Vancouver Posts: 11 iTrader: (0) Garage List 2006 330i [0.00]	I have a 2006 330i. Same question. I referred to the information on the door jam. Only thing is that I typically would have 2 people in the car at most, whereas the information on the door is based on max 4 occupancy.

04-06-2007, 02:01 AM	#5
AndrewAZ Major Drives: 335i Join Date: Jan 2007 Location: CA Posts: 1,244 iTrader: (0)	Off the top of my head I am running 32 psi in the front and 39 psi in the rear which provides a nice balance of handling and fuel economy along with having the car set up with pressure to cruise at 100 mph+.

04-12-2007, 08:59 AM	#11
kujo Major Drives: BMW Join Date: May 2006 Location: LA, CA USA Posts: 1,153 iTrader: (1)	on non RFTs, it's 10% of the curb weight +1/2 I run 36psi in front and 37 in the rear. I've always had great handling and also EXCELLENT tire wear. I check the pressures every weekend and every other weekend usualy add .5-1 psi, depending on tempeture changes and what not. kj

04-11-2008, 02:12 PM	#12
ahsan312 New Member Drives: 2006 325 I Plain Jane Join Date: Apr 2008 Location: Chicago Posts: 26 iTrader: (0)	So for my 325i running stock 16's with conti pro contact non run flats..should I run 32 in the front and 41 in the back??? Thanks I am newbie to this

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