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Old 07-23-2015, 04:48 PM   #1
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Question about "cold" psi

Getting ready to head out in about 2 hrs and I'm second guessing myself for this trip. My max rated psi is 50 psi "cold" on my Roo. I didn't get a chance to check the pressure until about 11am, outside temp at that time was around mid 80s. Pressure at that time was around 45psi in each tire. Since it's supposed to be 50 psi "cold", in mid 80s temp, is ~48 psi ok or is that too much given outside temps? Hoping for a quick response and TIA!
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Old 07-23-2015, 04:51 PM   #2
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Cold meaning the tire is not hot from travel.

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Old 07-23-2015, 04:52 PM   #3
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Fill it to 50 and go camping!

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Old 07-23-2015, 04:54 PM   #4
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Getting ready to head out in about 2 hrs and I'm second guessing myself for this trip. My max rated psi is 50 psi "cold" on my Roo. I didn't get a chance to check the pressure until about 11am, outside temp at that time was around mid 80s. Pressure at that time was around 45psi in each tire. Since it's supposed to be 50 psi "cold", in mid 80s temp, is ~48 psi ok or is that too much given outside temps? Hoping for a quick response and TIA!
it sounds like you are low, not high. Air expands as it get's hotter. Your 11 am pressure would be higher than your 7 am pressure, since the ambient air temp is hotter. If it was 45psi at 11 am, then it was probably 43-44 psi at 7 am.

You want at least 50 psi in your tire currently, and tomorrow morning it may be down to 48 so you can air it up again.

As you have it now, you are less than 50, and tomorrow morning will be even lower than it is now.
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Old 07-23-2015, 04:56 PM   #5
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Great thanks guys! I'll fill 'em up and wait. And wait. And wait. For the DW to pack her stuff lol.
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Old 07-23-2015, 04:57 PM   #6
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Great thanks guys! I'll fill 'em up and wait. And wait. And wait. For the DW to pack her stuff lol.
Always waiting on the dw.


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Old 07-23-2015, 05:01 PM   #7
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Always waiting on the dw.


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Sounds about right!
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Old 07-23-2015, 05:18 PM   #8
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The word "cold" should actually translated to ambient. Summer temps here in the early morning are about 80 degrees... If I go on a trip in summer, I start with my tires at max sidewall pressure that morning at 80. In winter, it may be 42... So, if I go on a trip in winter, again, it's max sidewall pressure at 42. Don't read too much into it...
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Old 07-23-2015, 05:41 PM   #9
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Do not exceed the maximum pressure (cold) it is that maximum.
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Old 07-23-2015, 07:23 PM   #10
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Usually the max pressure molded into the sidewall is much too high for a comfortable ride. The best way to get it correct would be to drive onto a weighbridge just leaving the axle you want to inflate on the scale. Divide the load the scale shows by the number of tires supporting the weight then inflate to the tire manufacturer's recommended pressure for that load.
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