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Old 12-26-2011, 04:54 PM   #15
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Originally Posted by Cat320 View Post
Thanks for the info guys. This is RV #5, so I'm aware of the method for determining how much air to put in the tires. The only reason I mentioned 125 is because that's the max it should ever take. I have no intention of putting that much it them now. As noted above, it would be very rough ride with 125 PSI in the tires and way too much pressure, especially in the rear tires.
Where did you come up with 125 being the max it should ever take? If from the tire sidewall then that's wrong. The pressure molded into the sidewall of truck/MH tires is the MINIMUM to support the MAXIMUM rating of the tires.

Quote:
From page 2 of the 06/07 Michelin RV Tire Guide: "If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and the minimum cold air inflation needed to carry the maximum load."
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Old 12-26-2011, 09:18 PM   #16
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Originally Posted by Mr_D View Post
Where did you come up with 125 being the max it should ever take? If from the tire sidewall then that's wrong. The pressure molded into the sidewall of truck/MH tires is the MINIMUM to support the MAXIMUM rating of the tires.
Thanks for backing me up so eloquently, D. I owe you a cold Rahr & Sons Storm Cloud IPA, overnight parking at the hacienda.

Folks, in the old days we'd have to walk our copy down the hallway and get chewed out by our editor for getting things backwards; all in a day's work.

Nowadays, we're solo. And, frankly, we're not as young as we used to be. A kernel of inverted information, a misunderstood maintenance practice, or general bad advice is normally harmless. On the subject of tires, it can be lethal.

Just to make sure we're all eventually on the same page, that no equipment is damaged or lives lost, please click HERE.

The link takes you to the Natl Hwy Transportation Safety Administration of the DOT, who governs tire certification, to the official DOT brochure designed to cut through the misinformation out there.

I'll print an exerpt from the brochure below, and copy the DOT's own markings key, lest confusion persists.


Understanding Tire Pressure and Load Limits

Tire inflation pressure is the level of air in the tire that provides it with load-carrying capacity and affects the overall performance of the vehicle. The tire inflation pressure is a number that indicates the amount of air pressure– measured in pounds per square inch (psi)–a tire requires to be properly inflated. (You will also find this number on the vehicle information placard expressed in kilopascals (kPa), which is the metric measure used internationally.)


Manufacturers of passenger vehicles and light trucks determine this number based on the vehicle's design load limit, that is, the greatest amount of weight a vehicle can safely carry and the vehicle's tire size.The proper tire pressure for your vehicle is referred to as the "recommended cold inflation pressure." (As you will read below, it is difficult to obtain the recommended tire pressure if your tires are not cold.)

Because tires are designed to be used on more than one type of vehicle, tire manufacturers list the "maximum permissible inflation pressure" on the tire sidewall. This number is the greatest amount of air pressure that should ever be put in the tire under normal driving conditions.
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Old 12-27-2011, 07:16 PM   #17
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The 125 PSI came from the Goodyear site. Where they state it is the min pressure to support the max load.
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Old 12-27-2011, 09:58 PM   #18
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Cat,
Not to complicate the excercsie but I might suggest you check out U-tube. There is an excellant video on this subject. Unfortunately I forgot the title.
The most importanat point to remember is that your compressor air system needs to be at a higher pressure point than the tires you are trying to inflate.
Example: If your tire is at 100psi and you want to raise it to 110psi, you need more than 110psi in your coach system. The video on U-tube does an excellant job of explaining this.
One way to accomplish this is to have a guage at the end of your hose prior to the nozzle. As the system in the coach is airing up watch the gauge rise. Now the important part. After your system completes airing up you should hear the bleed valve spit. Then and only then should you try raising the pressure in the tire. Another method is to have DW set in the drivers seat and pump the brakes to lower the pressure and cause the compressor kick on. Watch you gauge and only start airing up after the gauge is higher than the existing tire pressure.
Hope this helps. The U-tube video does a much better job than I.
Here's another way to make the air system turn the compressor back on without having a helper sitting in the driver's seat. I bought a 1 to 3 air manifold at Lowes, and installed it at the end of the air hose. One tap has a pressure guage, one tap has a bleed valve, and the third tap has a short air hose for inflating the tire. I pump air into the tire until I'm not getting good air flow. Then I remove the air chuck from the tire, open the bleed valve, and let the air pressure fall below the "compressor on" pressure. I then close the bleed valve, watch to see if the pressure begins to build, and then put the chuck back on the tire I'm trying to inflate. Fred
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Old 03-04-2012, 12:18 PM   #19
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Fred, I would like to use a bleed valve as you describe, but don't know what I'm looking for. Can you describe it and where to buy it?
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Old 03-04-2012, 04:46 PM   #20
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Fred, I would like to use a bleed valve as you describe, but don't know what I'm looking for. Can you describe it and where to buy it?
I bought all of the fittings, manifold, and bleed valve at Lowes, but any place that sells air compressor supplies should have it. The manifold is a small round device with one tapped hole on one side and three tapped holes on the other side so that you can have one air input and three air outputs. Into one of the output taps, I placed a fitting for my air chuck. Into the second tap, I placed a bleed valve, and into the third tap, I placed a pressure guage. The pressure guage will read the pressure in the air line, not the tire.

As to what the bleed valve looks like, it is a small device that screws in/out to close or open the air flow. (Small knob on right in 2nd picture below)







I've been using this setup for several years, and it sure makes inflating tires without a helper much easier.

Fred
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Old 03-05-2012, 06:37 AM   #21
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Perfect. Thank you!
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