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Author Topic: Tire load vs pressure Class A and enclosed trailer - I am so confused  (Read 418 times)

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budlight69

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I need some help with tire pressure vs load for a class A and enclosed trailer.  I was reading on the gd site about using the Michelin load chart.  I have weighed the M/H on the way to the dunes fully loaded. 

http://www.michelinrvtires.com/reference-materials/load-and-inflation-tables/#/

Rear axle:
My door sticker says 90 psi for the rears with max load at 13,500 lbs.  I am at 13,260 lbs (almost at max).  The Michelin chart says I can run 75 psi. 

Front axle:
The door sticker says 95 psi for the front with max load at 7,500 lbs.  I am at 5760 lbs.  The Michelin chart doesn’t even go that low but shows I can run 65 psi at that load. 

I would love to improve the ride as it is very rough, but do not want to sacrifice handling in the wind or corners, or introduce new tire problems.  I have always run 95 front and 90 rear, no issues. 

http://www.maxxis.com/trailer/trailer-tire-loadinflation-chart

The enclosed trailer weighed in at 6240, 1560 per tire.  The Maxxis site says I can go clear down to 30 psi?  I have been running 65 psi. 

So, do you guys use the door stickers or the charts?  thanks
« Last Edit: February 23, 2016, 03:29:51 PM by budlight69 »
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Lance-W

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #1 on: February 23, 2016, 02:53:23 PM »
I always run max (as shown on the tire) on the trailer.  I think it's better for the tires and I don't have to ride in it !  ;D

The Motorhome I'd run darn close to max on the rears.  The front's I'd be tempted to lower for a better ride (you sit right over top of them).  I'd run 10-20 less than max shown on the tire on the fronts.  Start with 10 less.  It will make a difference in the ride.  I also bought Bilstien shocks.  That made a difference too.  Bilstiens aren't cheap.
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fabr

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #2 on: February 23, 2016, 04:05:16 PM »
Get tire pressure and temperature monitors. Lower till you see tire temp go up. The charts are BS when comparing brand to brand .
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
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loyalty to the American people."
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fabr

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #3 on: February 23, 2016, 04:06:39 PM »
BTW  I run max pressure myself and have monitors.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

dsrace

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #4 on: February 23, 2016, 04:14:09 PM »
yep max psi here too......do you have air bags? also i will not run anything but kyb mono max or there gas adjust. your shocks may be weak
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dsrace

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #5 on: February 23, 2016, 05:48:31 PM »
lance is right you do sit over the front end. are your leaf springs or coils if you have them weak as well? maybe your sitting on your bump stops or hitting them?
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Because he will drag you down to his level and beat you with experience

budlight69

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #6 on: February 23, 2016, 06:21:55 PM »
Thanks for the input guys.  I love fabrs idea with the sensors, but I'm just too cheap  rofl  I will leave the trailer and rear axle at max, but dial back the front like Lance said, a little at a time. 
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fabr

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #7 on: February 23, 2016, 06:29:41 PM »
Buy a IR temp gun and stop after 30 miles or so and check them. Tightass!  ;D ;D Works just as well but in case of blowout or pretty quick pressure loss you won't get that effing beep,beep,beep warning that scares the hell out of you............ ;)  After having a trailer tire lose all pressure coming back from Fla. and not being to tell in how it pulled with the toterhome other than I barely heard it do a low pressure blowout. I bought the system.
« Last Edit: February 23, 2016, 06:39:51 PM by fabr »
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

Lance-W

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #8 on: February 23, 2016, 09:48:28 PM »
Actually the laser thermometer is a good idea.  We use that at autocross events to figure out at what pressure you get the largest contact patch.  Never thought about it for a motorhome tire...............
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Carlriddle

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #9 on: February 24, 2016, 06:27:32 AM »
I'll trade my drive for 4hr of bumpy ass drive to LS!!

E rated trailer tires I run at 70 (80 max)
Truck max rear when towing with airbags, fronts about 15 under for better comfort.  But nothing helps a couple of them damn bridge approaches in N Miss.  Truck and trailer left the ground at 75!!  Pucker factor.
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fabr

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #10 on: February 24, 2016, 06:48:47 AM »
Actually the laser thermometer is a good idea.  We use that at autocross events to figure out at what pressure you get the largest contact patch.  Never thought about it for a motorhome tire...............
Comes in handy checking hub temps as well as brakes . Good diagnostic tool.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
"I fear the day that technology will surpass our human interaction. The world will have a generation of idiots" Albert Einstein

budlight69

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Re: Tire load vs pressure Class A and enclosed trailer - I am so confused
« Reply #11 on: February 24, 2016, 08:37:48 AM »
Comes in handy checking hub temps as well as brakes . Good diagnostic tool.

Great idea, and I just got one for Christmas!  Check tires, hubs, tranny pan, beer, etc. 
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