Correct Tire Pressure for 19 Inch Wheels

marty-k · 05-31-2012, 11:13 AM

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?

gatorfast · 05-31-2012, 11:45 AM

35psi all around. Its in the manual.

ILSMKU · 05-31-2012, 11:59 AM

My door jam says 35 front and 36 rear. comp edition here though.

THE TECH · 05-31-2012, 12:05 PM

Quote:

Originally Posted by gatorfast

Its in the manual.

+1

Slalom · 06-23-2012, 05:25 AM

Mine has an additional sticker for speeds over 100mph (Comp Edition) 44psi

cole328 · 06-23-2012, 07:13 AM

Book says 35 all around I run, however, 35F and 38R, and the car seems to handle that much better

PhillyNate · 06-23-2012, 10:51 AM

Quote:

Originally Posted by ILSMKU

My door jam says 35 front and 36 rear. comp edition here though.

ditto

walsh · 06-29-2012, 12:21 AM

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...

klammer · 06-29-2012, 02:24 PM

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

Drifty// · 07-01-2012, 12:30 PM

Quote:

Originally Posted by gatorfast

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.

Drifty// · 07-01-2012, 12:49 PM

Quote:

Originally Posted by m3alabama

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?

gatorfast · 07-01-2012, 02:18 PM

Quote:

Originally Posted by Drifty//

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.

Drifty// · 07-01-2012, 03:32 PM

Quote:

Originally Posted by gatorfast

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?

tibra1 · 07-01-2012, 04:01 PM

Quote:

Originally Posted by ILSMKU

My door jam says 35 front and 36 rear. comp edition here though.

+1

dspralph · 07-02-2012, 02:21 PM

35 front and 36 rear on mine 2011

robbiedawg · 07-07-2012, 11:20 AM

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...

M3 Esq. · 07-07-2012, 10:54 PM

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!

miamiflgator · 08-16-2012, 09:22 PM

Mine says 35 F, 38 R on the door. Shoes are 19. It's an E93 though?

AlexTek · 01-03-2013, 08:47 PM

Quote:

Originally Posted by walsh

But as others have said...

+1
LOL

AlexTek · 01-03-2013, 09:42 PM

Mine is an M3 E92 2011 Competition Package and states on the door:
F35/R36
Over 100mph F41/R44

05-31-2012, 11:13 AM	#1
marty-k Registered Drives: 2008 M3 Join Date: Sep 2011 Location: Maryland Posts: 4 iTrader: (0)	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, 11:59 AM	#3
ILSMKU BMW FTW Drives: E92 M3 Join Date: Jul 2011 Location: ///OC Posts: 1,082 iTrader: (3) Garage List 2013 BMW E92 M3 [5.00] 2011 BMW E92 M3 [4.75]	My door jam says 35 front and 36 rear. comp edition here though. __________________ Jet Black E92 Competition Edition M3: MORR VS8.2 19" ET10 Brushed Silver Wheels/ BMW GTS Wheels, Megan Ti Exhaust, AFe Dry Filter, RPI Scoops, MS Power Pulley(365WHP), 3M Tint, JL Motoring Arkym Style Lip, LUX 8 LED Halo Kit, Full in/exterior LED Kit, BMW Performance Spoiler, Music Car NW Custom Trunk Sub Enclosure, 12" JL W3, 600:1 JL Audio AMP with Technic's Harness, Custom One Off Dave Navone HQ LOC and TLP Coding

06-23-2012, 05:25 AM	#5
Slalom First Lieutenant Drives: 04 Z4, 07 328xiT,12 M3 week 46 Join Date: Nov 2010 Location: Bern Posts: 310 iTrader: (0) Garage List 2007 BMW 328 xi Tou ... [0.00] 2012 BMW M3 Coupé [0.00] 2004 Z4 [0.00]	Mine has an additional sticker for speeds over 100mph (Comp Edition) 44psi __________________ Collelongo (AQ) BMW Club Sometimes I wonder why I drive BMW's then I drive something else and the doubt disappears.

06-29-2012, 12:21 AM	#8
walsh Second Lieutenant Drives: 2011 E92 M3 Join Date: Dec 2008 Location: Boston Posts: 282 iTrader: (2)	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... __________________ 2011 E92 M3 \| Le Mans Blue \| Carbon Leather \| Eisenmann Race \| Edition Grilles \| pic coming soon-ish

07-07-2012, 11:20 AM	#16
robbiedawg First Lieutenant Drives: 2008 ib e90 m3, 1995 acura nsx Join Date: Jan 2012 Location: chapel hill, nc Posts: 353 iTrader: (0) Garage List 2008 BMW M3 [0.00] 1995 ACURA NSX-T [0.00]	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... __________________ ~ TRAFFIC LAWYER IN CENTRAL NC ~ 2OO8 E90 M3 /// INTERLAGOS BLUE w/BAMBOO BEIGE, CARBON LEATHER / 6MT / 19" 220M FORGED WHEELS / PREMIUM / MOONROOF / IPOD / BSW SPEAKERS ~EVERYTHING IN MODERATION,INCLUDING MODERATION ~

05-31-2012, 11:45 AM	#2
gatorfast Lieutenant Colonel Drives: MR E90 M3 Join Date: Jan 2008 Location: SoFla Posts: 1,808 iTrader: (3)	35psi all around. Its in the manual.

06-23-2012, 07:13 AM	#6
cole328 Second Lieutenant Drives: 2011 M3 Convertible Join Date: Oct 2010 Location: FL Posts: 274 iTrader: (0)	Book says 35 all around I run, however, 35F and 38R, and the car seems to handle that much better

07-02-2012, 02:21 PM	#15
dspralph Taiwan Drives: 2011.5 'Reventon' E92 M3 Join Date: Apr 2008 Location: Troy, MI Posts: 123 iTrader: (1)	35 front and 36 rear on mine 2011

07-07-2012, 10:54 PM	#17
M3 Esq. Mind of an effing scientist. Drives: Safely Join Date: Aug 2007 Location: CT Posts: 1,045 iTrader: (2) Garage List 2013 BMW M3 [0.00]	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! __________________ 2013 M3 Coupe/DCT/ZCP/Speed Cloth/BMW Performance Exhaust/Dinan Goodies/CF Bits/Volk TE37 SL

08-16-2012, 09:22 PM	#18
miamiflgator New Member Drives: m3 Join Date: Jul 2012 Location: fl Posts: 18 iTrader: (0)	35/38 Mine says 35 F, 38 R on the door. Shoes are 19. It's an E93 though?

01-03-2013, 09:42 PM	#20
AlexTek Second Lieutenant Drives: BMW M3 E92 2011 ZCP Join Date: Jan 2011 Location: Puerto Rico Posts: 220 iTrader: (0)	Mine is an M3 E92 2011 Competition Package and states on the door: F35/R36 Over 100mph F41/R44 __________________ BMW M3 E92 2011 Fox Red Novillo/Carbon Leather/Competition Package/Premium Package 2/Convenience Package /Enhanced Premium Sound/Satelite Radio Jeep Grand Cherokee SRT8 2006 Mitsubishi Mirage Technica 1997 - 10:53@140.12mph @ Carolina w/550whp

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