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Old 11-09-2014, 06:04 PM   #1
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Tire pressure

Need some help on tire pressures. Weighed our Motorhome and got reading of front axle 4700 lbs. rear dual axel was 9700 lbs. tires are Michelin LT225/75R16... When I go to the Michilin guide it states maximum load for front is 2680 lbs @80psi and rear is 2470 lbs @ 80 psi. Is this for each tire. It does not clarify and I am sorry if this a stupid question but it makes no sense to me. Any help would be appreciated
Jimrose
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Old 11-09-2014, 06:19 PM   #2
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Jimrose, that is the max that each tire can handle safely. Look at this chart:

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Name:	ImageUploadedByForest River Forums1415575029.576063.jpg
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ID:	66148. Figure out the weight each tire has and then set the tire pressure for each tire based on that. I will calculate in a seperate post and you can see if you get the same result.


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Old 11-09-2014, 06:28 PM   #3
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The way I figured it was:

Front 4700/2=2350. On the chart it has 2335, so I would move up to the next number 2440, looking up the chart, that say to set each front tire at 70 lbs.

Rear 9700/2=4850. On the chart the number for dual over that amount is 4940, which is the max. It says to set each tire in the rear at 80 lbs.

Hope that helps.

Craig


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Old 11-09-2014, 06:31 PM   #4
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Superchief. Thanks I got similar results. Any concerns running the rear tires at max or should I have larger tires. These were the ones delivered with the RV
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Old 11-09-2014, 06:39 PM   #5
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I would say you are okay. What this tells me, is your rear weight max would be 9882 lbs (4940x2), and you front max weight on those tires is 5360 lbs (2680x2). I would also look at your weight stickers to see what you max weights on your coach should be. Right now you are at 14,400 lbs (4700+9700).


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Old 11-09-2014, 07:13 PM   #6
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On ours, we run 75 front and 80 rear. Just like the door jam sticker recommends.
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Old 11-09-2014, 09:19 PM   #7
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Max legal gross weight for your coach is 14,500 lbs. You are just under it at 14,400 lbs. Hopefully you weighted it with a full tank of fuel and all passengers on board. You only have 100 lbs left for anything or anybody more without taking some weight out.
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Old 11-10-2014, 05:11 AM   #8
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What does the sticker on the driver's door frame say? That is what the manufacturer recommends. On my Chevy chassis it is 65 psi front and 80 psi rear. Just as important as setting the right pressures is maintaining them. One of the first things I added was a tire pressure monitoring system. Wouldn't leave home without it.


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Old 11-10-2014, 05:20 AM   #9
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I don't have a MH so it might be different, but when I got new mich. for my F250 they said they filled them to the sticker on the door jam.
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Old 11-10-2014, 10:52 AM   #10
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Filled your data in my motorhome-tirepressure-calculator wich uses 10% reserve and calculates with an even saver formula then the tire-makers use.
then rear gives even 87 psi as advice , and thats allowed by the tire makers to go 10 psi over your AT-pressure of 80. front 77psi so 80 would not even be that bad.
These pressures give the maximum reserve for things like ,pressure loss in time, unequall loading right left, misreadings of pressure schales etc.
But still comfort and gripp is acceptable.
Here a picture I made of it.


And yes this means that your tires are yust enaugh so an upgrade to F-load for instance or a bigger sise would be wise.
But you dont have to be alarmed , no danger to the tires with these loads .
But see if you can find the GAWR's and GVWR to see if your motorhome is overloaded, thats also not allowed by law.
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