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Old 01-24-2007, 11:47 AM   #1
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I am curious as to the amount of tire pressure those of you with Toyo 11R22.5 tires are running. I have a copy of the Toyo tire inflation tables Dave Fernandez sent, but I have not corner weighed our coach. It weighs 29,650 lbs. overall. I know it is heavier on the left front corner because of the propane tank, and the fact my SmartTire shows that tire and the inside duals run 10-15 degrees warmer than the other tires.

I have been running 100 psi cold in the front and 90 psi cold in the rear tires, and they get up to about 115-118 psi in the front, and 100 to 105 psi in the rear after they are fully warmed up, according to the SmartTire system.

Those of you with a 36 MDDS (ours is a 2006), what tire pressures are you using or would you recommend? Especially interested in those who may have corner weighed the coach and have re algned their tire pressures.
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Old 01-24-2007, 11:47 AM   #2
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I am curious as to the amount of tire pressure those of you with Toyo 11R22.5 tires are running. I have a copy of the Toyo tire inflation tables Dave Fernandez sent, but I have not corner weighed our coach. It weighs 29,650 lbs. overall. I know it is heavier on the left front corner because of the propane tank, and the fact my SmartTire shows that tire and the inside duals run 10-15 degrees warmer than the other tires.

I have been running 100 psi cold in the front and 90 psi cold in the rear tires, and they get up to about 115-118 psi in the front, and 100 to 105 psi in the rear after they are fully warmed up, according to the SmartTire system.

Those of you with a 36 MDDS (ours is a 2006), what tire pressures are you using or would you recommend? Especially interested in those who may have corner weighed the coach and have re algned their tire pressures.
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Old 01-24-2007, 12:24 PM   #3
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Oldforester,

I have a 2006 36 FDDS. The rig gross is 28640 lb. Front axel is 10560 and rear is 17960. The four corner weights are as follows:
LF = 5300
RF = 5220
LR = 7900
RR = 8100

I run 110 psi in the fronts and 105 psi in the rears. I believe it is normal for the inside rear tires to run hotter as mine does. The fronts come up to temp and pressure equally. Another thought to keep in mind is the more you use the service brakes, the hotter the inside tires run. I have learned to use the exhaust brake a much as possible.

sdcyclist
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Old 01-24-2007, 07:08 PM   #4
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sdycylist,

Thanks for giving me your information. This is what I was looking for. I assume your tire pressures are cold pressures? If so, I need to raise mine 10 psi each to get in line with yours.
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Old 01-25-2007, 09:05 AM   #5
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I have an '05 36MDDS and I run 110# in front and 95# in the rears. I have not had an opportunity to weigh my coach yet, but I am fairly lightly loaded, and I have had these tire pressures suggested to me by the majority of 36' Alpine owners I've asked, so I'm going with it for the time being.
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Old 01-27-2007, 07:08 PM   #6
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Tom & Patty
These folks need your help.....Get your tire pressure chart out,And give them your good advise!!!!!
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Old 01-30-2007, 03:38 PM   #7
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We are back. Buried my Father this last Saturday in Iowa. It was 5 degrees and 30 mile per hour winds. Bbrrr. We were out in Connecticut 2 Saturdays ago at the hospital where he passed away. I have been off line for 11 days. You Alpiner's have been busy

It is good to be back.

Toyo says to run the fronts at full inflation pressure. Which is 110 lbs for a "G" load range tire. An 11R22.5 carries 6175 lbs @110 psi.

I run 295/75R22.5 @ 95 psi in the fronts of my 2000 36FDS, grossing 10,500 and 85 in the rear, grossing about 17,000. I have even thought about lowering my rear pressure, the safety margin is there.

An 11R22.5 @ 95 psi carries 220 more lbs per tire than a 295/75R22.5. These capacities apply to Bridgestone designed tires.

I won't tell you what psi to run, but at 110 the tire is stiff and the sidewalls are not flexing as designed.

Before you do ANYTHING . All four corners of the coach need to be weighed.

Check out this site.
http://www.bridgestonetrucktires.com...g/rv/index.asp
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Old 01-30-2007, 05:50 PM   #8
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Tom and Patty......Our condolences at the loss of your Dad. Happy to see you back on the forum. Hope to see you guys at SoCal rally in Las Vegas.
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Old 01-31-2007, 07:39 AM   #9
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Tom and Patty,

Thanks for your input. I have "H" rated Toyo 11R22.5 tires, so maximum load is 6610 lbs at 120 psi cold - single tire and 6005 dual. I haven't found a place to corner weigh my coach yet, but I would guess it won't be significantly different than sdcylist, but I'm 1000 lbs heavier overall. If this is the case and I add 250 lbs to each corner of his weights, I would be about 5550 lbs in the front corners and 8350 on the rear corners.

At 100 psi cold in the front the Toyo table says it will carry 5950 lbs single and 5625 dual. At 90 psi cold it carries 5205 dual.

It appers to me that until I get this corner weighed I have plenty of safety factor at 100 psi cold in the front and 90 psi cold in the rear based on adjusting the weights of sdcyclist's coach above. Based on these adjusted weights I would have 450 lbs/tire safety margin in the front and almost 1000 lbs/tire in the rear. I probably could lower the pressure in the rear to 80 psi if I wanted to, but I'll wait until I corner weigh it.

Does anybody know of a place to get a coach corner weighed in the Palm Springs/Indio, CA area?
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Old 01-31-2007, 10:15 AM   #10
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There is a Flying J truck stop in Thousand Palms- maybe they do. Give them a call.
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Old 01-31-2007, 11:19 AM   #11
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Hi Tom & Patty,

John and I wanted to express our sympathy to you on the loss of your Dad. That is always a difficult time.

If you get out to our LV rally or the Hemet rally, can you please bring your tire pressure chart? We would really like to have a copy!

Thanks, and welcome back!

Gail
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Old 02-01-2007, 04:16 AM   #12
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Ref: Toyo Tire Pressure:
We have a 2005 34'FDDS Alpine and our tire tag up by the fuel fill cap which I believe was supplied by Toyo. The recommended pressures on it reference 120# for front tires & 90# for the rear tires. In fact within the last year and a half I received a letter from both WRV and Toyo to run whatever pressure is on that tag.
I felt with that kind of notice I had best use the pressure that the manufacturer of the product suggested and I do.
Interesting comment, I took my motorhome in for inspection 3 weeks ago and told them what the tire pressure should be.They checked the pressure and charged me $ 50.00 for 1/2 hour labor charge. I was completely stunned and contained myself (which is not easy for me at all) from saying anything at the dealers. I had to attempt to regroup my thoughts and will now call the President of the motorhome store. This is the location that I purchased the motorhome from.
I certainly continue to learn something everyday.
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Old 02-01-2007, 06:18 AM   #13
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50 bucks. That must have been a rare inert gas . I'd be furiuos too .

Going back to the Toyo's. Never run less than the manufacturer's sticker reads. My counsellor
tells me to say that.

As I said before, 120 Ted, Toyo and your dentist are in cahoots .
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Old 02-01-2007, 06:44 AM   #14
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WRV told us to run tires at full inflation - just like the tag on the front wall (behind generator slide) states.

Later Toyo sent a technical notice stating exactly the same - run at full inflation rating - regardless of loading.

We run front tires at 120# and rear at 110#.

2006 FDDS Limited.

Audrey
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