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Old 06-21-2013, 11:35 AM   #1
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Airing down hot

So after an hour on the highway driving to the trailhead, hot tire pressure upper 50's or more. Do you leave a little margin for cooling on the air down, check them again soon, or just drop pressure to off road value you want and never look back?

Thanks!

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Old 06-21-2013, 12:02 PM   #2
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Dang 50psi....... you got a Cummins in that thing?

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Old 06-21-2013, 12:32 PM   #3
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Mine are 53 PSI according to the dash display. That was set by either the dealership or the factory. Doorjam says 43.
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Old 06-21-2013, 01:12 PM   #4
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Funny that a truck with a Cummins only comes with 55/60 psi in the front and 40 in the back. Wonder why people at the dealership think a JK needs over 50 in them?


To answer the OP don't worry about leaving room for temp expansion/ contraction. H ow low do you plan on going?
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Old 06-21-2013, 03:03 PM   #5
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Funny that a truck with a Cummins only comes with 55/60 psi in the front and 40 in the back. Wonder why people at the dealership think a JK needs over 50 in them?


To answer the OP don't worry about leaving room for temp expansion/ contraction. H ow low do you plan on going?
I have tended to not air down as far as might be best, feeling that the crawling on trails would not generate or maintain the kind of heat expansion that I see from going 70 down the highway for a couple hours. I guess I am lazy in that I should check the tires again after an hour on the trail, but usually don't bother. Was just wondering what others were doing. Maybe I am overthinking this and should just drop my pressures to as low as I want at the trail head and not worry...
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Old 06-21-2013, 03:11 PM   #6
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I've never noticed a difference.

My tires will usually be around 40 after an hour on the highway. I'll drop to 16-18 at the trailhead and don't notice them dipping at all later on based on the EVIC reading.
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Old 06-21-2013, 03:13 PM   #7
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I don't crawl, so don't go really low anyway. I run 285/70/17 duratracs at 32 cold. I never look at what they heat to, and air down to 18-20 at trailhead and roll.
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Old 06-21-2013, 03:44 PM   #8
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Tire pressure rises (or drops) 0.8 psi for every 10°F tire temp increase (decrease). And, pressure rises (or drops) 0.5 psi for every 1000 feet increase (decrease) in altitude.

So, you can pretty quickly estimate the "cold tire psi" equivalent.


EDIT: You can also use this info to estimate current tire temperature by comparing the current pressure to what the cold inflation pressure and temp was...
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Old 06-21-2013, 04:44 PM   #9
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Mine just tells me the tire pressure on the instrument panel under the spedometer.
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Old 06-21-2013, 04:44 PM   #10
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Thanks everybody, that helps! I will do some more testing of the tire pressure once on the trail and see how it holds. Sounds like it will hold pretty close to my dropped level generally so no worries...
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Old 06-21-2013, 04:53 PM   #11
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Quote:
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Mine just tells me the tire pressure on the instrument panel under the spedometer.
I only get a low tire warning light, no numbers...
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Old 06-21-2013, 05:11 PM   #12
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I only get a low tire warning light, no numbers...
I don't know if mine is a 2013 thing, a Rubicon thing or a 10A thing.
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Old 06-21-2013, 05:22 PM   #13
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I don't know if mine is a 2013 thing, a Rubicon thing or a 10A thing.
2013 - 14, with connectivity group option....
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Old 06-21-2013, 05:28 PM   #14
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2013 - 14, with connectivity group option....
Ah... Not on my '12 Rubi

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