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      05-31-2012, 11:13 AM   #1
marty-k
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Correct Tire Pressure for 19 Inch Wheels

I recently purchased a used 2008 M3 e92 with 19 inch wheels but the door jam has the tire pressures for 18 inch wheels. Apparently the wheels were replaced at some point. Does anyone know the correct pressures for 19 inch wheels?
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      05-31-2012, 11:45 AM   #2
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35psi all around. Its in the manual.
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      05-31-2012, 11:59 AM   #3
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My door jam says 35 front and 36 rear. comp edition here though.
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      05-31-2012, 12:05 PM   #4
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Quote:
Originally Posted by gatorfast View Post
Its in the manual.
+1
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      06-23-2012, 05:25 AM   #5
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Mine has an additional sticker for speeds over 100mph (Comp Edition) 44psi
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      06-23-2012, 07:13 AM   #6
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Book says 35 all around I run, however, 35F and 38R, and the car seems to handle that much better
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      06-23-2012, 10:51 AM   #7
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Quote:
Originally Posted by ILSMKU View Post
My door jam says 35 front and 36 rear. comp edition here though.
ditto
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      06-29-2012, 12:21 AM   #8
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Just want to put this out there for everyone asking about different tire pressures based on wheel and tire size. PSI = pounds per square inch(yes... I'm sure you all know this), its a ratio. So 35 psi is the same "tire pressure" no matter what size wheel or tire you have. Lets do some simple(not realistic tire) numbers for everyone.

Lets say the internal area of your tire is 100 square inches, to get 10 PSI you put in 10 lbs of pressure.

Now lets say you go to a wider tire with the same height. The internal area will naturally increase, to say 120 square inches. To get 10 PSI you now need 12 lbs of pressure.

Since PSI is a pressure to area ratio, it automatically takes care of the pressure increase/decrease for a difference in tire size.

The difference in PSI from car to car is based on the load carried as well as the purpose of the car. But in general most cars range from 28 PSI to 36 PSI.

But as others have said...
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      06-29-2012, 02:24 PM   #9
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Quote:
Originally Posted by walsh
Just want to put this out there for everyone asking about different tire pressures based on wheel and tire size. PSI = pounds per square inch(yes... I'm sure you all know this), its a ratio. So 35 psi is the same "tire pressure" no matter what size wheel or tire you have. Lets do some simple(not realistic tire) numbers for everyone.

Lets say the internal area of your tire is 100 square inches, to get 10 PSI you put in 10 lbs of pressure.

Now lets say you go to a wider tire with the same height. The internal area will naturally increase, to say 120 square inches. To get 10 PSI you now need 12 lbs of pressure.

Since PSI is a pressure to area ratio, it automatically takes care of the pressure increase/decrease for a difference in tire size.

The difference in PSI from car to car is based on the load carried as well as the purpose of the car. But in general most cars range from 28 PSI to 36 PSI.

But as others have said...
I was just thinking this, size doesn't matter this time, everything else does
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      07-01-2012, 12:30 PM   #10
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Quote:
Originally Posted by gatorfast View Post
35psi all around. Its in the manual.
We're talking about the 220M's, right?

Mine says:
Front (245/35R19): 33 PSI (or 41 PSI for > 100 mph)
Rear (245/35R19): 35 PSI (or 44 PSI for > 100 mph)
The tires on it were PS2's.

If the previous owner switched wheels/tires, be warned that your speedometer could be off (unless he had it re-calibrated). You can estimate the error by going to tirerack and checking their #of rotation per mile spec. The ratio between this for the old and new tires will tell you approx how low/high the speedo will tend to read. For instance, if the new tires are smaller (rotate more times per mile), then your speedo will say you're going faster than you really are. Obviously, going to a larger-radius tire is the case to watch out for.

Oh, and word has it speed is computed based on the rear wheels.
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      07-01-2012, 12:49 PM   #11
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Quote:
Originally Posted by m3alabama View Post
You are correct that PSI is essentially PSI no matter what size, however a low profile 19 inch tire compared to a high profile 17 or even 18 inch profile has different inherent rigidity to the side-walls and less flex which means it requires different pressure to illicit the same type of feel and handling. Slip angles of the tires, grip etc is all different as side-wall flex changes. You need a higher PSI in a higher profile tire to create a similar rigidity of the side-wall to a lower profile tire with less pressure.

So while it does for some things it does not matter, handling absolutely will be different for the same PSI in a low to high profile tire
Actually, there's a way to determine the proper PSI for a different set of tires. Even if they're the same size as stock, PSI could be different. Check it:
Inflation of non-OEM sizes?
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      07-01-2012, 02:18 PM   #12
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Quote:
Originally Posted by Drifty// View Post
We're talking about the 220M's, right?

Mine says:
Front (245/35R19): 33 PSI (or 41 PSI for > 100 mph)
Rear (245/35R19): 35 PSI (or 44 PSI for > 100 mph)
.
Yes 220M's. Weird, my manual says 35 all around and 35/36 for speeds over 100. Door jam says 35 all around as well.
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      07-01-2012, 03:32 PM   #13
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Quote:
Originally Posted by gatorfast View Post
Yes 220M's. Weird, my manual says 35 all around and 35/36 for speeds over 100. Door jam says 35 all around as well.
What year? ZCP? (I guess not, or they'd be different wheels)

I'm looking at 2008. Both manual and door jam say 33/35 for me.

Maybe they changed it to get a bit more understeer?
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      07-01-2012, 04:01 PM   #14
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Quote:
Originally Posted by ILSMKU View Post
My door jam says 35 front and 36 rear. comp edition here though.
+1
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      07-02-2012, 02:21 PM   #15
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35 front and 36 rear on mine 2011
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      07-07-2012, 11:20 AM   #16
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i have factory 19" 220m wheels.

the door jamb says 35/35.the manual says 35f/36r.i know it's just one pound different for the rear,but which one would you go with? it's good to have important problems like this...
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      07-07-2012, 10:54 PM   #17
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I run 36 psi all around. Comp wheels and contis. I don't think you are going to notice much difference between 35 and 36 psi on the street. Robbiedawg is right - these are clearly first world problems. Cheers!
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      08-16-2012, 09:22 PM   #18
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35/38

Mine says 35 F, 38 R on the door. Shoes are 19. It's an E93 though?
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      01-03-2013, 08:47 PM   #19
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Quote:
Originally Posted by walsh View Post
But as others have said...
+1
LOL
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      01-03-2013, 09:42 PM   #20
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Mine is an M3 E92 2011 Competition Package and states on the door:
F35/R36
Over 100mph F41/R44
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