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Old 07-11-2014, 04:10 PM   #1
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Tires and air compressor

Hello folks I haven't been on the forum for the last two months. I finally picked up my new MotorHome from Nexus in Indiana. I purchased a 28p the P is for Phantom the unit is 30ft. Anyway really enjoying it. But going crazy spending money on items I need for it but I guess that's a part of it. I am looking to buy a air compressor for the tires Any recommendations? Also what is the best way to get the right air pressure in the tires without weighing the unit do I just go by the label on the door that The motorhome company put on it? Thanks this is all new to me
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Old 07-11-2014, 04:16 PM   #2
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Hello folks I haven't been on the forum for the last two months. I finally picked up my new MotorHome from Nexus in Indiana. I purchased a 28p the P is for Phantom the unit is 30ft. Anyway really enjoying it. But going crazy spending money on items I need for it but I guess that's a part of it. I am looking to buy a air compressor for the tires Any recommendations? Also what is the best way to get the right air pressure in the tires without weighing the unit do I just go by the label on the door that The motorhome company put on it? Thanks this is all new to me
Welcome back.

I'll let others address the China and compressor questions, but I would probably use the PSI on the tires themselves until you can get it weighed and set them properly. The tires should be marked with the minimum PSI required to carry their maximum rated load. May well result in a rough ride for a while.

Best of luck

Rick
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Old 07-11-2014, 04:24 PM   #3
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I'm gonna carefully disagree with Rick. You should have a tire information sticker/plate near your driver's seat. It will have tire size and stuff like that. It will also give you tire pressure setting from the manufacturer. These are based on the manufacturer's best guess for the most loading the axle can take and also takes into consideration some % of difference between the left and right side. As Rick said, even those numbers could cause a harsher ride than you might have with tire pressure set to the specific weight of the axles but it will be sufficient to be safe.

When I picked up my coach from the dealer after purchase they had put 8 new tires on it. I should have checked the pressure. They put the maximum 120 PSI in all of them. According to the sticker they should have put 115 in the steerers, 85 in the driver & 75 in the tag wheels. Can you say HARSH ride?
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Old 07-11-2014, 04:29 PM   #4
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I'm gonna carefully disagree with Rick. You should have a tire information sticker/plate near your driver's seat. It will have tire size and stuff like that. It will also give you tire pressure setting from the manufacturer. These are based on the manufacturer's best guess for the most loading the axle can take and also takes into consideration some % of difference between the left and right side.
No need to be careful Don. I get disagreed with a lot.

So does the mfgr sticker assume the rig is fully loaded to GAWRs?

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Old 07-11-2014, 04:36 PM   #5
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I agree with Don. The pressure indicated on the placard should be for a fully loaded (maxed out) coach. So once you have it weighed, you may be able to take some air out of the tires.
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Old 07-11-2014, 04:39 PM   #6
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It looks like the manufacture sticker which is Ford was covered by the MotorHome company with their own sticker
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Old 07-11-2014, 04:40 PM   #7
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No need to be careful Don. I get disagreed with a lot.

So does the mfgr sticker assume the rig is fully loaded to GAWRs?

Rick
Mine does. I have to ASSUME that would be a DOT kinda of requirement.

It is pretty easy to verify simply by using the GAWR/2 and comparing that to the tire pressure chart. There should be some fudge room for more weight on one side than the other. Mine has some built in.

I talked to a Newmar dude in the know and they confirmed that was the case. I had that discussion with him because Newmar derated my front GAWR from 14,600 to 14,200 primarily for tire size. However, I found that my coach is pretty well balanced sift to side and I can easily run the axle at 14,600 and only have to use 115 PSI. I just had my coach weighed at the Spartan factory and was at 14,280 and can run 110 PSI for that weight.

Obviously, I can't speak directly to any other brand's approach to this but, again, I assume DOT guidelines would make them all do something similar.
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Old 07-11-2014, 04:42 PM   #8
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It looks like the manufacture sticker which is Ford was covered by the MotorHome company with their own sticker
That wouldn't surprise me based on my experience and my previous post. The coach manufacturer has the final say on that.

What does your sticker say and how does that compare to the max tire pressure for your tires.
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Old 07-11-2014, 04:42 PM   #9
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Cola ny

There is a recent thread here that talks about various air compressors that people are using.
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Old 07-11-2014, 04:44 PM   #10
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Porter Cable makes a nice pancake style compressor. 135psi and it's 3.5 gal. Get it at Home Depot or Lowes $99
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Old 07-11-2014, 05:24 PM   #11
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As far as PSI's what is the lowest on a compressor I should buy for class c
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Old 07-11-2014, 07:02 PM   #12
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Our C tops at 80 psi on rears. Others may be higher. You need some margin on the compressor. Our compressor is rated at 125 psi. It was about $60 at WM.


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Old 07-11-2014, 08:12 PM   #13
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Hey Howie 80 PSI on the rear how about your front
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Old 07-11-2014, 08:30 PM   #14
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Porter Cable makes a nice pancake style compressor. 135psi and it's 3.5 gal. Get it at Home Depot or Lowes $99
I just bought one earlier this week. It is actually rated at 150 PSI. Unfortunately I bought it a little to late. Last week I had a blow out and the spare tire was at 40 psi and not 85. So I had to get it filled up at a service station. That was a waste of time and money. I spent the entire time on the pump to raise it 8 PSI. I was going to check the spare pressure before we left after I checked the other tires (I always do a tire check before each trip) but totally forgot about the spare. Im sure I will never need the compressor now but least I have one.
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