E-Class (W211) 2003-2009

Cold Tire Pressure

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Old Jun 15, 2011 | 04:05 PM
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Tesla Model S P100D
Question Cold Tire Pressure

So what do they mean by Cold tire pressure?

If you've driven the car for a while how long should let the tires sit to get an accurate reading for the "cold tire pressure" settings printed on the fuel cap?

Last night I let the tires cool for about 5 minutes at the gas station before I inflated and checked the tire pressure and I hope that is enough. I set the front tires at 33 and the rear tires at 35. Each tire had a different pressure before I checked and inflated the tires so I'm glad I did that...

Oh and I used 78% nitrogen in my tires

Last edited by WEBSRFR; Jun 15, 2011 at 04:07 PM.
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Old Jun 15, 2011 | 04:20 PM
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Tires should sit for a few hours if checking at a station, do not drive more than a few miles.
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Old Jun 15, 2011 | 04:24 PM
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Oh. Good to know.. I guess I need to do this all over again now because when I checked the pressure I had driven the car for about 45 minutes. It was about 68 degrees outside FWIW...

Can you recommend a really precise/good quality tire gauge?

If someone can recommend a compressor that has a good quality tire gauge built in, that would be even better!
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Old Jun 16, 2011 | 12:20 AM
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Check here. a lot of good gauges here.

http://www.getagauge.com/
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Old Jun 16, 2011 | 01:00 AM
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Originally Posted by Barry45RPM
Check here. a lot of good gauges here.

http://www.getagauge.com/
Awesome! Thanks. I especially like the pass through feature so you don't have to constantly switch back and forth between the gauge and compressor... Just hope they are accurate... Not a brand I know...

Wouldn't it have been nice if Mercedes had an outlet coming out of the Airmatic pump for inflating tires?
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Old Jun 16, 2011 | 01:14 AM
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Oh and I just found the same on Amazon for less with free Prime shipping

http://www.amazon.com/G-H-Meiser-EZ-...8200788&sr=8-1

I also found this kit that I will buy just in case I am stranded some place far away from a service station...

http://www.amazon.com/gp/product/B00...=ATVPDKIKX0DER
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Old Jun 16, 2011 | 06:51 AM
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Originally Posted by WEBSRFR
So what do they mean by Cold tire pressure?

If you've driven the car for a while how long should let the tires sit to get an accurate reading for the "cold tire pressure" settings printed on the fuel cap?

Last night I let the tires cool for about 5 minutes at the gas station before I inflated and checked the tire pressure and I hope that is enough. I set the front tires at 33 and the rear tires at 35. Each tire had a different pressure before I checked and inflated the tires so I'm glad I did that...

Oh and I used 78% nitrogen in my tires
Did you pay extra for the Nitrogen?
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Old Jun 16, 2011 | 08:11 AM
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78% nitrogen?

Isn't that what the atmosphere normally has?
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Old Jun 16, 2011 | 08:13 AM
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Originally Posted by edwinwalke
Did you pay extra for the Nitrogen?
I was wondering about that also -- maybe he was joking.

Regards,
paul...
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Old Jun 16, 2011 | 08:23 AM
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When I check the pressure in the tires, I always do it first thing in the morning. I believe this will give me the most accurate pressure reading for the tires has had a chance to fully cool down overnight with the cooler night time temps.
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Old Jun 16, 2011 | 11:13 PM
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Tesla Model S P100D
Originally Posted by edwinwalke
Did you pay extra for the Nitrogen?
Nope. I used special Earth Air that comes with 78% Nitrogen

Yes, it is a small joke given some of the nitrogen in tire discussions we've had lately!
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