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Old 05-02-2013, 04:01 PM   #31
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Air pressure changes about 1psi for every 10 deg of pressure. So if your tires were at 70 deg F to start they were at 170 deg at the end. What did your TPMS say about temps?
That's a good question. Trip was couple weeks ago and I don't remember temp numbers, I'm sure it wasn't 170 or I probably would have been freaking out thinking that's way to high. Seems like I remember around 100 degrees or so.
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Old 05-02-2013, 04:11 PM   #32
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At 100 deg you should have only seem a 3 psi increase.

Hmmmm. I wonder what is up here.
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Old 05-02-2013, 04:17 PM   #33
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At 100 deg you should have only seem a 3 psi increase.

Hmmmm. I wonder what is up here.
Next trip I will keep a log of psi and temps to try and figure out.
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Old 05-02-2013, 04:29 PM   #34
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At 100 deg you should have only seem a 3 psi increase.

Hmmmm. I wonder what is up here.
Ours gain from 5-10 lbs also and the temp never gets close to 170 I have the alarm set at 157 and it has never gone off.

Maybe your data is not applicable to tires?
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Old 05-02-2013, 06:04 PM   #35
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Ours gain from 5-10 lbs also and the temp never gets close to 170 I have the alarm set at 157 and it has never gone off.

Maybe your data is not applicable to tires?
X3

Perhaps the issue is the vaporization of the water in the tire. It doesn't follow the "ideal gas" rules.
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Old 05-05-2013, 04:02 PM   #36
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I once asked a stemm-importer about the pressures for stemms.
The information I got was that the stemms are tested to stand the pressure-rising from 18 dgr C /65dgr F to 100dgrC wich is boilingpoint of water, convert it yourselves. This can happen incidentically by the heat of the brakes transported trough the rimms. The maximum pressure of normal rubber snap in stemms ( the 400 series) is 4,5 to 4,8 bar ( 65 to 70 psi ) at 18 dgr C/65F filled, and an extra pressure by temperature rising of 1,8bar/26psi they are tested for at the mildest american standard.
Thought it might be interesting to know.

The 1 psi at 10dgrF rising is a rule of tumb, wich does not go for larger temperature or pressure risings. I once made a spreadsheet for playing with the temperature and pressure, and filled in the 50 to 60psi rising rockport gave
here the picture
Mind that what the tpms gives is not always accurate
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Old 05-05-2013, 05:27 PM   #37
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Ours gain from 5-10 lbs also and the temp never gets close to 170 I have the alarm set at 157 and it has never gone off.

Maybe your data is not applicable to tires?
According to http://members.home.nl/jadatis/press...onwithtemp.xls

My tires would have to gain 14 lbs to set the alarm off @ 157 if I set them @ 65# when the temperature was 65.
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Old 05-05-2013, 07:54 PM   #38
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I hope you guys are kidding about the nitro tires going bang! You do realize "N" is an inert gas, right?
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Old 05-05-2013, 08:29 PM   #39
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I hope you guys are kidding about the nitro tires going bang! You do realize "N" is an inert gas, right?
Understand exactly that nitrogen is an inert gas, but nitro which is what the op posted is slang term for nitroglycerin which will go BANG!
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Old 05-05-2013, 08:51 PM   #40
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I'm the OP and the sticker on the side of my TT says tires are filled with "Nitro". I go over speed bumps very slow. ( Just kidding).
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