Thread Tools Display Modes
Old 03-11-2014, 08:28 PM   #1
boatman's Avatar
Join Date: May 2013
Location: St Charles, Mo
Posts: 92
Air preasure

Leaving on first trip of the year to Nascar race in Bristol TN Thursday my question is I set the air preasure in my tires Saturday when it was 45 degrees at 80 psi today it's 80 degrees so being courteous I checked them again they were at 85 psi if they gain that much in 40 degrees what does cold temp mean .

boatman is online now   Reply With Quote
Old 03-11-2014, 09:00 PM   #2
Fulltime family RVer
ependydad's Avatar
Join Date: Nov 2011
Posts: 16,628
Cold temp means after the tire has been sitting and before you get going. If the day's travels start at 45, cold temp is 45. If the day's travels are 85, cold temp is 85.

2012 Ram 3500 DRW/crew cab/long bed/4x4/4.10 gears pulling a 2017 Spartan 1245 by Prime Time
Checkout my site for RVing tips, tricks, and info | My family and I have fulltimed since June 2015
ependydad is offline   Reply With Quote
Old 03-11-2014, 09:13 PM   #3
Senior Member
DaGrinch's Avatar
Join Date: Sep 2013
Location: Western MD
Posts: 1,284
This is known as Charles's Law. As a gas warms, it expands - the volume increases, thus creating more pressure. In reverse, as it cools, it looses volume and there is less pressure.
The mere fact they expanded 5psi in a 40 degree temp change just sitting would indicate to me to check the pressures just before I left, so as to not have the pressure expand too much once on the road. Being a race fan, you know tire temps can adversely affect tires and tire wear.

"Sunny" the 2017 Sunseeker 3010DS
2006 Jeep Liberty Toad
.... and lovin' life........MOST of the time.
DaGrinch is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:14 PM.