Does anyone know what is a safe increase in PSI from a cold start to traveling down the road in warm climates?
Left home the other day...tires aired to 110 PSI, TPMS read 111 exactly on all four tires. Temperature was in the low 50's. later that afternoon TPMS read 130 PSI, tire temps between 85-90 with outside ambient temperature in the 80's.
Is a 20lb increase in PSI an acceptable margin?
2011 Heartland Big Country 3450TS
2007.5 Chev LMM Duramax/Allison
2010 FLHTC Electra Glide Classic Red Hot Sunglo
Heartland Owners Club - Washington Chapter Leaders
It is what it is. 85-90 degrees is not beyond the tire's designed ability to operate in. 110 psi cold is not beyond the tire's max inflation pressure spec (if the are 110 psi tires). The pressure is going to do what it's going to do and you have no reason to worry about it, unless you're trying to run 110 psi cold in 80 psi rated tires...
As long as the maximum air pressure listed on the sidewalls is not exceeded.
Tire Rack says "The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower)."
My posts shouldn't be taken for factual data. They are purely fictional, for entertainment purposes and should not be constituted as actually related to scientific, technical, engineering, legal, spiritual or practical advice. Amen.
fordsooperdooty wrote: As long as the maximum air pressure listed on the sidewalls is not exceeded.
Tire Rack says "The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi (up with higher temperatures and down with lower)."
OK but...the maximum air pressure listed on the sidewall is 110. The GY614's are ST tires (per Goodyear information) and are usually run at max PSI. Trying to follow the don't exceed rule can't work unless you underinflate to start with.
Not arguing just "thinking"...1 lb per 10 degrees doesn't sound reasonable. My tires can change 5-10 degrees just from the sunny vs the shady side of the rig!
The 110 psi max inflation figure is for the tires when cold, meaning you haven't been driving on them. Check them first thing in the morning before drive on them. As long as they are at 110 psi when cold, it doesn't matter what pressure they are when they heat up from driving on them. They are made to deal with normal pressure and temperature increase from driving. You have nothing to worry about.
Wow - I should check mine out of curiousity. I didn't think it would go that high. But as others have stated, even if I get a higher reading than you did I'm still confortable with a cold inflation to 110 psi.
2006 Ford F350 4X4 SB CC SRW Powerstroke 6.0
2013 Redwood 36RL - full paint - disk brakes
"Comparison is the thief of joy! - Theodore Roosevelt"
I have regularly seen 16-20 psi increases in my tire pressures and they start out at 80.
One of the disadvantages of tire pressure monitor systems is that you have enough information to scare you. Just like after I added the Scangauge to my instrument panel. Now I watch the water and oil temperatures and worry alot more about my engine coming apart than I used to.
RTer
My 80PSI rated XPS Ribs start out at 80 PSI and under normal 85 - 90 deg days and after an hour at 60 - 63 MPH will get up to 94 PSI (at which time my TST sensors go off, as I have them set to 94 PSI)..I will usually slow down a few MPH and the pressures will drop a few lbs....NOTE. not all of the tires hit 94 PSI...only 1 or 2 will.
My tires, as measured by my sensors, generally run about 10 deg higher than the ambient air temp.
During yesterday's 2.5 hr trip, at 75 - 80+ deg F, 60 MPH, all 4 tires read 88 lbs PSI - about a 10% increase in pressure, which was low. They started out in the cool morning at 79 PSI.
Hope this helps....
OBTW, I tired asking Michelin the same kind of question some time ago and they would not give me an answer. Too many variables.
2008 GMC Sierra C/C 2500HD D/A - w/Titan 52Gal tank
Ride Rite Airbags, Trail Air Pin Box, Garmin Nuvi 1450LMT,
Blue Ox Bed Saver, TST Tire Monitor, Yamaha EF2000is,
2009 Cedar Creek Silverback, GII, 32 WRL w/ XPS RIBS
Have GY 614 RST's on our trailer. When bringing it home from California (San Diego area)through Imperial Valley and Arizona, the tire pressure monitor displayed pressures ranging from 123 psi shady side) to 128 psi ("sunny side") with ambient temps in the high 90's, traveling between 55 & 60 mph. The high pressure alarm went off a couple times, I slowed my speed, the tire(s) cooled and the pressure dropped. Your numbers sound normal.
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