What PSI for tires
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CLS55 2006, CLS 63S 2015
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From: San Diego, CA
'04 E55; '03 E500 Sport
Running a lower PSI will not help the ride much on 35 or 40 series tires, but will seriously (negatively) affect tire wear/lifetime. I've only had my 55 for a month but am using the factory settings - 38f/40r psi with just me in the car.
I used to run Pirelli P7's 285f/345r tires on my RSR and 930's, and lowering the psi below 38 or so would wear out the center of the tread prematurely.
I used to run Pirelli P7's 285f/345r tires on my RSR and 930's, and lowering the psi below 38 or so would wear out the center of the tread prematurely.
Last edited by dbarrym; Sep 1, 2008 at 03:03 AM.
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From: San Diego, CA
'04 E55; '03 E500 Sport
Of course this was mid-80's tire technology, sidewalls are (I'm sure) much stiffer now.
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I am using the factory settings - 36f/36r psi for my E63 .. but with Nitrogen not Air .... and some one told me that there is difference between Air psi and Nitrogen's psi .. !!
So, plz tell me what Nitrogen's psi that should be equal Air psi at 36f / 36r ??
So, plz tell me what Nitrogen's psi that should be equal Air psi at 36f / 36r ??
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E63 P30, CL500 Sport
What's your feedback on Nitrogen? Is ride quality any better or worse?
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Nitrogen simply DOES NOT expand as quickly as air, so there is some SMALL benefit. It will make NO difference on the street, except to cost you more my friends.
See yeah
PS: Please don't try the Hydrogen, it was for comic releif only guys.
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From: NJ
2005 E55
Curious - where did you get your factory settings from? I could swear that my door and the sticker behind the gas cap cover tell me to keep it at 35 all around with just me in the car.
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'04 E55; '03 E500 Sport
35 psi is fine for daily use, you are correct re gas filler door sticker. To each his own.
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From: San Jose, CA
2007 E63 w/P30 and Eurotech CF Diffuser
+3
Nitrogen is simply not necessary for the street. The ONLY advantage I can see is that nitrogen fills have NO water.
If it was normal air at 21% oxygen and 78% nitrogen with no water vapor it would behave identically.
Water can change states and result in a larger tire pressure change with temp.
PV=nRT does not change much at all.
http://www.chalkbored.com/lessons/ch...aw-handout.pdf
Edit: Yea, I was right.
http://www.cartalk.com/content/colum...tember/05.html
Nitrogen is simply not necessary for the street. The ONLY advantage I can see is that nitrogen fills have NO water.
If it was normal air at 21% oxygen and 78% nitrogen with no water vapor it would behave identically.
Water can change states and result in a larger tire pressure change with temp.
PV=nRT does not change much at all.
http://www.chalkbored.com/lessons/ch...aw-handout.pdf
Edit: Yea, I was right.
http://www.cartalk.com/content/colum...tember/05.html
Last edited by Jon2007E63P30; Sep 3, 2008 at 03:18 PM.
