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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



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      04-06-2007, 12:58 AM   #1
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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)?
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      04-06-2007, 01:10 AM   #2
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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.
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      04-06-2007, 01:12 AM   #3
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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
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      04-06-2007, 01:35 AM   #4
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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.
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      04-06-2007, 02:01 AM   #5
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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+.
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      04-06-2007, 11:20 AM   #6
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I usually run 34psi in all my tires.
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      04-06-2007, 11:24 AM   #7
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should be moved to tire section where there are expert lurker waiting to answer like Gary.
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      04-10-2007, 04:48 PM   #8
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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)?
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      04-11-2007, 09:46 PM   #9
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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.
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      04-12-2007, 03:56 AM   #10
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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.
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      04-12-2007, 08:59 AM   #11
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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.

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      04-11-2008, 02:12 PM   #12
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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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