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Old 02-21-2004, 09:09 PM   #1
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MH Tire presure?

I confussed. The new Goodyear tires on the front of my MH tire sidewalls call for 110 lbs, but the Owners manual says 70lbs. That's a 40 lbs difference, and that is a real BIG difference !

Right now the tires have 110lbs in them, it rides like a log waggon, and it wanders all over the road.

I wish I knew what the correct pressure really was.

Stumped.
Don
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Old 02-21-2004, 09:22 PM   #2
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It sounds like you might have 12 ply tires? If so that's the max cold pressure that tire calls for. This tire is made to carry a heavier load than the weight of your motor home so you have a little extra reserve. By inflating to the higher presure your ride will be harder and your emergency stopping distance will be longer. As for the wandring, that sounds more like a loose steering box or front end which is not related to the higher tire pressure. Good luck and happy trails, Stuart
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Old 02-22-2004, 07:14 AM   #3
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Don,

I have/had the same queston with regards to my recently purchased 1994 33' LY. Here's what I think. The tires you have on your LY (me too) are not the orig. spec tires. I suspect you have 8R19.5 tires with max load at 110 PSI. I also suspect that the orig. tires were something like 225/70R19.5F which support more weight at a lower PSI.

Goodyear has a nice chart that shows the differences (FOR THEIR TIRES), and the impact on load capacities if you lower the PSI.

http://www.goodyear.com/rv/pdf/rv_inflation.pdf
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Old 02-22-2004, 07:29 AM   #4
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thanks for that link. The Classic MH I have had 90 lbs per tire in it when I first bought it and drove it home. Rode like a truck of course.
I read the manuals, and for our models the inflation rates ranged from 55-75lbs.
I dropped mine to 60 and improved the ride tremendously. Since then I have added Bilstein shocks and steering stabilizer, and with the correctly inflated front air bags, the ride is totally different than my early ownership experience.

There is a chart posted in mine with suggested inflation rates on it.
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Old 02-22-2004, 10:12 AM   #5
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Don and all other New MH guys like me. I remember my Father in Law, who just passed away, weighing his front and rear axle fully loaded. I now see why as it all came back in: http://www.michelintruck.com/micheli...VTIREGUIDE1pdf
(Link is moved but this will get you there, just keep clicking) Guide works for all brand of tires as long as you have your brands inflation vs lbs which you all ready have. Michelin chart is also available and you have all ready posted Goodyear. Yes it does appear all of us new MH people are big time over inflated for weight. I am trying to get ready for a trip and don't have time to get to scales, would someone give us approximate weight on our axles for this type of rig so we can get closer. I'll bet it is going to tell us that we need a lot less air than we have now. Ron
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Old 02-22-2004, 10:54 AM   #6
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some more food for thought...maybe we should go by the potential max gross weight, that is, the most the vehicle should weigh as published in the owners manual. The actual weight of the vehicle, of course, will change depending on the fuel load, number of people on board etc..
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Old 02-22-2004, 11:07 AM   #7
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'82 310 weight

Front 5260
Rear 8700
30 gas, full water, Mh loaded for vacation and two people on board.
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Old 02-22-2004, 11:28 AM   #8
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How about weight on these 90s model Land Yachts like Don and I have? Anybody weighed them?
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Old 02-22-2004, 07:01 PM   #9
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I couldn't get the Goodyear site to open the pressure page. Don't know what's up with that.

But another point to consider is the pressure the rim is built for. On another forum someone stated that the max pressure was 85 to 95 lbs max. If that's true, with 110lbs I'm 15 to 25 lbs over the max pressure the rims were designed for.

I'm trying to get ready for a 500mile trip this coming weekend, and I'm still confused !

Stumped in Arkansas
Don
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Old 02-22-2004, 07:20 PM   #10
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Alcoa Rims

The Alcoa Forged Wheels (aluminum) that are original 1987 are rated max 90 psi with a bias ply tire, and 95 psi with a radial ply.

Both tire types provide a max rim load rating of 2780 lbs per tire.
Most of the modern (post Y2K) tires have a weight rating in excess of the above, but my rims limit me to 5560 lbs on the front axel.

Be aware that there are several different allowable max weights for various axels that were used over the years on the P-30 series chassis.
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Old 02-22-2004, 07:58 PM   #11
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donnall, I pulled up your Good Year numbers from Wildtoad's suggessted site and also will give you the numbers for our max potential gross weight with a couple of assumptions. Our max front Axle weight is 5000 lbs and if divided equally each front tire would carry 2500 lbs. The rear axle is rated for 10,000 lbs maximum and each dual tire would carry 2500 lbs. Now I know you are supposed to weigh each postion seperately and not make assumptions that left and right are the same or that the vehicle is loaded to the max. However, since we are assuming the numbers are: Goodyear minimum pressure for a Single 8R19.5 at 2540 lbs is 70 lbs sq in. The dual in the rear is derated to carry 2610 lbs at 75 lbs sq in. That is as close as you can get using the Goodyear numbers. My Michelin numbers are only slightly different because they can carry a little heaver load at lower pressure. The tire pressure suggested on our front driver's door is 70 lbs front and rear. The calculated numbers are very close to the suggested use for a RV at our assumed heavest weight. Ride and handling are sacrificed if you carry much higher pressures. At 100 lbs your tire can cary 3305 lbs front and each dual can carry 3195 lbs in the rear. This is way over the gross vehicle numbers and much more suitible for a truck carrying heaver loads. I am going to let some air out of my tires tomorrow before I head out on my trip. Your min numbers are 70 front and 75 rear using the Goodyear numbers at max gross weight. Higher pressure will reduce handling and braking distance. Weighing our vehicles will surely ease our minds as per the posted Michelin Site cited above. Ronassuming
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Old 02-22-2004, 08:07 PM   #12
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Quote:
Originally posted by donnall
I couldn't get the Goodyear site to open the pressure page. Don't know what's up with that.

But another point to consider is the pressure the rim is built for. On another forum someone stated that the max pressure was 85 to 95 lbs max. If that's true, with 110lbs I'm 15 to 25 lbs over the max pressure the rims were designed for.

I'm trying to get ready for a 500mile trip this coming weekend, and I'm still confused !

Stumped in Arkansas
Don
Don, don't go over the max inflation pressure of the lowest amount. If your tires say 110, and your wheels say 95, inflate to no more than 95. I got into an argument with my boss over that, he told me to inflate to the higher pressure, which I did under protest. I was vindicated a few weeks later when the vehicle came back with a fractured rim. I got an apology from my boss, and he got to write a check for a new wheel for the customer. It could have been much worse....
Have a safe trip.
Terry
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Old 02-22-2004, 10:22 PM   #13
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Thanks guys,
I'll be letting the presure down tomorrow.

Ron, you must have got your new engine installed. Bring everyone up to speed on what you had done and how it went.
Thanks again
Don
PS: now if I could just get my LP heat to work I'd be set to go.
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Old 02-22-2004, 10:29 PM   #14
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Donnall, Talked about engine on the Mechanic section. Ready to go to Florida. No A/C as my unit appears to have been converted to 134A and was not done correctly. I will make last miniute attempt to get new dryer and evacuate and recharge tomorrow before heading out. Ron
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