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Old 01-06-2016, 03:06 PM   #1
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TT tire pressure increase while on the road

I've done a search, but not found the answer I'm looking for, so here goes,,,,, During our last outing, in a new to us TT, I was monitoring tire pressure and temperature, and watched pressures climb to close to 80 psi after 2 hours on the interstate after starting out at a cold 65 psi. I'm guessing TT weight is about 10,000 lbs total, with the tongue at 1000 lbs with the WDH. I have not had a chance to scale it, since that was out first outing,,,,, but the big question is - for those of you with TPMS - what kind of pressures do you see after being on the highway at 60 mph?
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Old 01-06-2016, 03:12 PM   #2
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I see a 6-10 psi increase in cooler temps and 10-14 psi increase in summer, on my TPMS.

My MH is a bit over 11,000# and my Toad is about 2600#
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Old 01-06-2016, 10:22 PM   #3
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TT tire pressure increase while on the road

Seems a little high to me. I have 7200 lbs on my axles and run 'E' rated tires with 65 lbs pressure. The highest I saw on a 4000 mile trip last summer was 71 lbs. How much did the tire temperature go up? I think about 10 lbs over would be considered 'normal' for summer. Mine run cool I guess.


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Old 01-07-2016, 05:37 AM   #4
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I think it's a bit high too. I'm on ST225/75R15 'D' rated tires, that's what came on it. There's another thread I found where a chart by Goodyear is advising up to 10 PSI above max on sidewall for heavy loads. (not that that increases load capacity or speed ability) I would think that by starting out with 70 PSI in the tires, I could stop a little bit of sidewall flex that's creating the higher carcass temps and resulting pressure increase. Thoughts?
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6 year old Springer rescues Sydney and Piper
2014 GMC Denali 3500HD Dually Crew Cab Duramax/Allison stock
2016 Dutchmen Denali 287RE "The Dog House"
Eaz Lift WDH 1400# w/ Blue Ox 2 1/2" trunion
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Old 01-07-2016, 06:13 AM   #5
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pressure rises approximately 1 psi for every 10 degrees. Nitrogen is not affected by temperature changes. Might want to consider switching to nitrogen if you want you pressures to remain more constant.
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Old 01-07-2016, 06:42 AM   #6
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Good point. These tires DO have nitrogen in them, or so says the sticker on the TT over them,,,,,,
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6 year old Springer rescues Sydney and Piper
2014 GMC Denali 3500HD Dually Crew Cab Duramax/Allison stock
2016 Dutchmen Denali 287RE "The Dog House"
Eaz Lift WDH 1400# w/ Blue Ox 2 1/2" trunion
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Old 01-07-2016, 07:18 AM   #7
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We have never seen PSI increases like you state! Normal increase around 5 PSI on all 4, slightly more on the Sunshine Side! We run Air in tires! What do you set your Hi Temp and Hi PSI Alert at? Youroo!!
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Old 01-07-2016, 07:25 AM   #8
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You stated a Chart by Goodyear,but what are your Tires on your Dutchman TT? As you talk about Sidewall flex? Youroo!!
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Old 01-07-2016, 07:38 AM   #9
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Youroo, Westlake is the name on the sidewall, I think. A private label brand as we called them when I was in the auto/tire business. We saw 79 psi on the left side tires, (shade) at 64 mph on the trip up, and 71 psi both sides sun and shade on the trip back at 61 mph.

Sidewall flex - as we look at a radial tire loaded, on the ground, there is a 'squat' to the tire and a slight bulge in the sidewall. As the tire rolls, the sidewall flexes. Naturally, it causes internal friction in the carcass plies, and that creates heat, and the heat increases tire pressure. At some point, the heat causes the tire to dismantle itself. As we learned in Goodyear tire school, tires are 'bonded' together under pressure and heat. Get them too hot, and you can guess the rest.
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2014 GMC Denali 3500HD Dually Crew Cab Duramax/Allison stock
2016 Dutchmen Denali 287RE "The Dog House"
Eaz Lift WDH 1400# w/ Blue Ox 2 1/2" trunion
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Old 01-07-2016, 07:52 AM   #10
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This is why we Removed the tires that Came on our unit! They were like Bologna Skins, when removed you could WAD them up,replaced with Maxxis! Sidewalls on them are Very Strong! I only reference this in regards to Sidewall Flex,which Builds Heat and makes for a Road Wallering RV! Youroo!!
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