Tirerack
Use the following links to go directly to useful tirerack winter items: Tirerack Winter Tires. Gary's Winter Tire FAQ.
Using the links directly supports E90Post with tirerack sales commision!

  E90Post
 


TireRack

   PLEASE HELP SUPPORT E90POST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Ideal Tire Pressure



Wheels and Tires forum Sponsored by The Tire Rack
Please help to directly support e90post by doing your tirerack shopping from the above link. For every sale made through the link, e90post gets sponsor support to keep the site alive. Disclaimer

Reply
 
Thread Tools Search this Thread
      04-06-2007, 12:58 AM   #1
natedogg
Nate
United_States
21

 
natedogg's Avatar
 
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.
Appreciate 0
      04-06-2007, 01:10 AM   #2
gos
Captain
18

 
Drives: E90 330xi
Join Date: Jan 2006
Location: Colorado


Posts: 960
iTrader: (0)

Quote:
Originally Posted by natedogg View Post
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.
__________________
--
330xi SG/Terra/Burl -- ZPP, ZSP, ZCW, CA, Sirius, PDC
Appreciate 0
      04-06-2007, 01:12 AM   #3
luckyguyinla
Private
5

 
Drives: E90 335I SEDAN
Join Date: Mar 2007
Location: la ca


Posts: 53
iTrader: (0)

Quote:
Originally Posted by natedogg View Post
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
Appreciate 0
      04-06-2007, 01:35 AM   #4
Vancouver E90
New Member
Canada
1

 
Vancouver E90's Avatar
 
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.
Appreciate 0
      04-06-2007, 02:01 AM   #5
AndrewAZ
Major
55

 
AndrewAZ's Avatar
 
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+.
Appreciate 0
      04-06-2007, 11:20 AM   #6
BoostedBMW
Moderator
United_States
105

 
BoostedBMW's Avatar
 
Drives: TiAg E92 335
Join Date: Oct 2006
Location: Raleigh, NC


Posts: 6,787
iTrader: (14)

Garage List
2003 S2000  [0.00]
Send a message via AIM to BoostedBMW
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
Appreciate 0
      04-06-2007, 11:24 AM   #7
txusa03
Major General
284

 
Drives: TS330iPPSP6MT
Join Date: Jul 2005
Location: Planet Earth


Posts: 6,567
iTrader: (2)

should be moved to tire section where there are expert lurker waiting to answer like Gary.
__________________
under construction!
Appreciate 0
      04-10-2007, 04:48 PM   #8
MX20
\oo==0|0==oo/
4

 
MX20's Avatar
 
Drives: 320d
Join Date: Mar 2007
Location: Europe, Romania


Posts: 103
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'..."
Appreciate 0
      04-11-2007, 09:46 PM   #9
Fraggy
Brigadier General
United_States
85

 
Fraggy's Avatar
 
Drives: 2007 e90
Join Date: Jun 2005
Location: San Diego


Posts: 3,321
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--
Appreciate 0
      04-12-2007, 03:56 AM   #10
MX20
\oo==0|0==oo/
4

 
MX20's Avatar
 
Drives: 320d
Join Date: Mar 2007
Location: Europe, Romania


Posts: 103
iTrader: (0)

Quote:
Originally Posted by gos View Post
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.
__________________
"...ssssix blade knife, do anything fo' ya'..."
Appreciate 0
      04-12-2007, 08:59 AM   #11
kujo
Major
89

 
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
Appreciate 0
      04-11-2008, 02:12 PM   #12
ahsan312
Enlisted Member
1

 
Drives: 2006 325 I Plain Jane
Join Date: Apr 2008
Location: Chicago


Posts: 30
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
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 03:28 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST