Those w/20s...what air pressure are you running?

disruptv · 02-23-2010, 07:57 AM

I have oem 18s now and am upgrading to aftermarket 20s...I'm going to run 255/30/20 and 285/30/20 if it matters on 20X9 and 20X10.5...

I was curious what air pressure everyone here runs on their 20s as I want the wheels 2 be properly inflated....is there a formula to calculate the proper air pressure when you go +2?

Thanks everyone

p.s. max psi is 51psi in the tires

disruptv · 02-23-2010, 09:59 PM

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E92M3Guy · 02-26-2010, 10:26 PM

What is the offset of your wheels? You might want to check your rear tires.

I have 20x10 et20 and with 285/30/20 I rubbed on bumps as well as when I have passengers in the back. 285/30/20 is too tall for what it is. I know 3 other enthusiast who ran in the same situation bc the tire that is thrown around is all wrong. You should be running 285/25/20 to get the rub free solution. Some vendors that suggest 285/30/20 and they are wrong, I listened to one of the main vendors here and it was a mistake I did bc it was a headache. I end up running 275/30/20 and the rubbing was all gone.

Most people run from 35-38 psi when cold all around.

Ca$hOnly · 02-27-2010, 01:57 AM

I run 38psi on my pirelli p-zero nero's.

MrHarris · 02-27-2010, 06:39 AM

I'd run 34-35 front, 37-38 rear unless you got INVO's then I'd go higher.

PunjabiM3 · 02-27-2010, 09:33 AM

Quote:

Originally Posted by MrHarris

I'd run 34-35 front, 37-38 rear unless you got INVO's then I'd go higher.

Why higher on the INVO's?

E92M3Guy · 02-27-2010, 10:38 AM

INVOs have a soft sidewall so people raise the psi so it doesn't bend their wheels when they hit a pothole or so.

disruptv · 02-27-2010, 08:20 PM

thanks 4 the heads up everyone

MrHarris · 02-28-2010, 05:31 AM

Quote:

Originally Posted by PunjabiM3

Why higher on the INVO's?

Also at highway speeds the steering response is terrible and feels very unstable. Raising the pressures help this, but at the expense of slight reduction of ride comfort.

02-23-2010, 07:57 AM	#1
disruptv Major 86 Rep 1,139 Posts Drives: 3M Join Date: Sep 2006 Location: ny iTrader: (10) Garage List 09 3m [0.00]	Those w/20s...what air pressure are you running? I have oem 18s now and am upgrading to aftermarket 20s...I'm going to run 255/30/20 and 285/30/20 if it matters on 20X9 and 20X10.5... I was curious what air pressure everyone here runs on their 20s as I want the wheels 2 be properly inflated....is there a formula to calculate the proper air pressure when you go +2? Thanks everyone p.s. max psi is 51psi in the tires
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02-23-2010, 09:59 PM	#2
disruptv Major 86 Rep 1,139 Posts Drives: 3M Join Date: Sep 2006 Location: ny iTrader: (10) Garage List 09 3m [0.00]	b u m p . . .
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02-26-2010, 10:26 PM	#3
E92M3Guy Second Lieutenant 6 Rep 203 Posts Drives: Black E92 M3 Join Date: Oct 2008 Location: San Diego / OC iTrader: (0)	What is the offset of your wheels? You might want to check your rear tires. I have 20x10 et20 and with 285/30/20 I rubbed on bumps as well as when I have passengers in the back. 285/30/20 is too tall for what it is. I know 3 other enthusiast who ran in the same situation bc the tire that is thrown around is all wrong. You should be running 285/25/20 to get the rub free solution. Some vendors that suggest 285/30/20 and they are wrong, I listened to one of the main vendors here and it was a mistake I did bc it was a headache. I end up running 275/30/20 and the rubbing was all gone. Most people run from 35-38 psi when cold all around.
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02-27-2010, 01:57 AM	#4
Ca$hOnly Major 47 Rep 1,073 Posts Drives: E92 M3 Join Date: Apr 2009 Location: In ur fridge, eatin ur foodz iTrader: (5)	I run 38psi on my pirelli p-zero nero's. __________________
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02-27-2010, 06:39 AM	#5
MrHarris yodog 197 Rep 5,025 Posts Drives: '86 Corolla Join Date: Jun 2007 Location: Diamond Bar, Ca iTrader: (5) Garage List 2009 BMW [10.00]	I'd run 34-35 front, 37-38 rear unless you got INVO's then I'd go higher. __________________ 2009 E92 M3 \| Alpine White \| Black Extended \| Advan RS \| Turner Test Pipes \| Dinan Axle-Back \| OETuning \| Eibach Springs \| UUC SSK \| VRS Front Lip \| VRS Type I Diffuser \| Matte Black \| RPi Scoops \| MS Filter \| Yokohama AD08 \| F1 Pinnacle Special Thanks: Gintani \| OETuning \| eAs
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02-27-2010, 10:38 AM	#7
E92M3Guy Second Lieutenant 6 Rep 203 Posts Drives: Black E92 M3 Join Date: Oct 2008 Location: San Diego / OC iTrader: (0)	INVOs have a soft sidewall so people raise the psi so it doesn't bend their wheels when they hit a pothole or so.
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02-27-2010, 08:20 PM	#8
disruptv Major 86 Rep 1,139 Posts Drives: 3M Join Date: Sep 2006 Location: ny iTrader: (10) Garage List 09 3m [0.00]	thanks 4 the heads up everyone
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