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Old 02-17-2017, 04:11 PM   #1
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Tire Pressure

Hi Friends,

I have a 2016 Leprechaun 320BH (class c). I notice my duel rear tires close about to rub. No loss of pressure, have been like this for about 8 months. I use her about once a month. I finally read the Michelin tires and they say 80 PSI COLD. I'm Currently at 70 psi cold and within 25 miles of them heating up they are at 80 psi hot. Now that's a 10 psi difference. Seems a lot. Now if I fill 'like the tires say' to 80psi cold that means I'll heat it will driving to 90psi cold?!? Is this safe, or am I missing something here? All 6 tires are at the same 70 cold and no leaks. Michelin LTX M/S LT225/75 R16. I do notice in my personal F150 those heat up too, 2-3 pounds difference not 10 or is it cause I'm under pressure on this MH. Thank you everyone in advance!

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Old 02-17-2017, 09:04 PM   #2
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I'm no tire expert, but I'm sure he will come along soon.
The tire says 80psi COLD, pretty sure all tires that I'm aware of are supposed to be checked while cold, and yes they will increase in pressure after driving and heating up, it should all be good, I'm sure it's not going to blow if it's 10psi higher when heated up, you would hope the manufacturer would have built it better than that.
I'm not even going to get into the fact that you might not need 80 psi in the tires on your MH, if you haven't weighed your unit fully loaded for a trip it's a guess and by golly deal.
I'm sure the tire experts will sound off soon and baffle you with their brilliance.
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Old 02-17-2017, 09:09 PM   #3
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Our truck tires increase by 10 psi. also, I am not concerened, they are fine and it is all calculated into the manufacturing of the tire. I always set them to 80psi. cold. A lot of people run heavier than I do and don't have problems.
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Old 02-17-2017, 09:30 PM   #4
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Tires are supposed to be checked first thing in the morning while tires are cold. I run 110lbs in my trailer tires and I have a TPMS on the tires and I can watch the lbs go up once the tires get hot and on hot days too. It's not a problem the tires are designed that way
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Old 02-17-2017, 09:45 PM   #5
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If you're up to it, read this tire pressure thread: http://www.forestriverforums.com/forums/f219/tire-pressure-increase-when-towing-105484.html
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Old 02-18-2017, 05:01 PM   #6
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First checked if your tires where realy AT80 psi so LRE /E-Load/10 Plyrated) and in this loadindex 115/12 they are
One tire is allowed to carry 1120kg/2470 lbs upto 160km/99m/h in dual construction when pressure is 80 psi.
This is less then for single load .
So your rear axle if equally devided R/L is allowed to carry 4 times 2470 lbs =9880 lbs AT 80 psi .
So what you have to determine is howmuch load you have on the axle, or better per side of the axle .

Once you know this you can see if the 80 psi is enaugh.

How did you determine the pressure warm , was it by TMPS, and where inner and outer tires same pressure?

A pressure rising from 70 to 80 psi is about 14% rising, and to my conclusions this is to much if you drive about 55m/90km/h.
You would expect about 11% rising is to 78 psi , so can also be a little misreading, and then stil alright.

But best would be to let me calculate a pressure for you .
Then when we are busy do it complete at once, so also for front.

Need the weigths loaded the way you use the motorhome.
Also the maximum speed you use and wont go over for even a minute.

From tires I already know enaugh.

then I will give 2 advices , one lowest pressure for the speed you drive, at wich still reserve for R/L unbalance , but yust no overheating of any part of tire when realy driving that speed constant.

Then an highest advice with maximum reserve , but still acceptable comfort and gripp.

Idea is then to fill to the highest pressure advice , and if in time pressure drops to the lower advice, you still are save.
But can also be that you think to fill to that highest advice , but by inacuracy of pressure -measurement and inacurate determination of wheigt, you end up with yust enaugh pressure to avoid tiredamage.

If the pressure for the rear is right , the tires wont touch eachother with the sidewalls.

If you did not weigh , give the Gross axle weight ratings ( GAWR's F and R) and Gross Vehicle weight rating ( GVWR), then I will estimate, but gives less acuracy.
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Old 02-18-2017, 05:30 PM   #7
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Pressure fluctuates with temperature. That is why you are supposed to check them COLD, as stated on the tire.

This is not a new thing...
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Old 02-18-2017, 08:29 PM   #8
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Quote:
Originally Posted by jadatis View Post
First checked if your tires where realy AT80 psi so LRE /E-Load/10 Plyrated) and in this loadindex 115/12 they are
One tire is allowed to carry 1120kg/2470 lbs upto 160km/99m/h in dual construction when pressure is 80 psi.
This is less then for single load .
So your rear axle if equally devided R/L is allowed to carry 4 times 2470 lbs =9880 lbs AT 80 psi .
So what you have to determine is howmuch load you have on the axle, or better per side of the axle .

Once you know this you can see if the 80 psi is enaugh.

How did you determine the pressure warm , was it by TMPS, and where inner and outer tires same pressure?

A pressure rising from 70 to 80 psi is about 14% rising, and to my conclusions this is to much if you drive about 55m/90km/h.
You would expect about 11% rising is to 78 psi , so can also be a little misreading, and then stil alright.

But best would be to let me calculate a pressure for you .
Then when we are busy do it complete at once, so also for front.

Need the weigths loaded the way you use the motorhome.
Also the maximum speed you use and wont go over for even a minute.

From tires I already know enaugh.

then I will give 2 advices , one lowest pressure for the speed you drive, at wich still reserve for R/L unbalance , but yust no overheating of any part of tire when realy driving that speed constant.

Then an highest advice with maximum reserve , but still acceptable comfort and gripp.

Idea is then to fill to the highest pressure advice , and if in time pressure drops to the lower advice, you still are save.
But can also be that you think to fill to that highest advice , but by inacuracy of pressure -measurement and inacurate determination of wheigt, you end up with yust enaugh pressure to avoid tiredamage.

If the pressure for the rear is right , the tires wont touch eachother with the sidewalls.

If you did not weigh , give the Gross axle weight ratings ( GAWR's F and R) and Gross Vehicle weight rating ( GVWR), then I will estimate, but gives less acuracy.


I run my trailer tires at what it say on tires, 110lbs cold. Sometimes I see with my TPMS they are at 124lbs in summer. I usually run at 63 but sometimes run 75 if I'm in a hurry. Works for me
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