Do some tires/wheels hold air pressure better than others?

wdkwang · 05-09-2012, 05:02 AM

I've had my z for 15 months now and it's a daily driver, and parks outside on the driveway every night. I noticed with Sport wheels/tires (and now Hankook v12 replacement in the rear) that I've never had to fill up or adjust air at all except when it's winter time. All the beating I've put them through (burnouts, drifting, launches, high speed runs), it's never read any other number except 35 everytime.
I'm curious because other cars I've had or dealt with had to get a fill every once in a while or just had randomly different air pressures all around the car after some time. So what's the deal?

kenchan · 05-09-2012, 12:49 PM

1psi change per 10F ambient temp change if you are using air.

nitrogen will change much less.

TypeOne · 05-09-2012, 03:26 PM

Valvestems can also affect tire pressure... Most aluminum valve stems will leak overtime. I have experienced it in the past with track wheels on my other cars. The stock rubber stems seem to hold up better.

kenchan · 05-09-2012, 04:00 PM

hummmm... not in my case. my SSR's and Weds both use metal stems and they do not leak air. the metal caps themselves have o-rings inside to seal for dual air cap.

05-09-2012, 05:02 AM	#1 (permalink)
wdkwang Track Member Join Date: Nov 2010 Location: N/A Posts: 899 Drives: slidewayz Rep Power: 20	Do some tires/wheels hold air pressure better than others? I've had my z for 15 months now and it's a daily driver, and parks outside on the driveway every night. I noticed with Sport wheels/tires (and now Hankook v12 replacement in the rear) that I've never had to fill up or adjust air at all except when it's winter time. All the beating I've put them through (burnouts, drifting, launches, high speed runs), it's never read any other number except 35 everytime. I'm curious because other cars I've had or dealt with had to get a fill every once in a while or just had randomly different air pressures all around the car after some time. So what's the deal? __________________ Powerhouse Amuse \| K&N Typhoon Intakes \| MotorDyne ART Pipes \| Borla Catback Exhaust \| B&M Short Shifter \| Intake Ducts \| Ichiba 25mm F/R Spacers \| Carbon Fiber Interior Vinyl Wrap \| Tints \| 10000k HIDs \| Vtak, yo!

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05-09-2012, 12:49 PM	#2 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	1psi change per 10F ambient temp change if you are using air. nitrogen will change much less.

05-09-2012, 03:26 PM	#3 (permalink)
TypeOne A True Z Fanatic Join Date: Jul 2010 Location: Baton Rouge, LA Posts: 2,682 Drives: BSM 370 Rep Power: 1850	Valvestems can also affect tire pressure... Most aluminum valve stems will leak overtime. I have experienced it in the past with track wheels on my other cars. The stock rubber stems seem to hold up better.

05-09-2012, 04:00 PM	#4 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	hummmm... not in my case. my SSR's and Weds both use metal stems and they do not leak air. the metal caps themselves have o-rings inside to seal for dual air cap.