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Old 01-22-2009, 12:59 PM   #99
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Rubber valve stems are designed for up to 65 PSI. Metal ones would have a higher pressure rating. Like to 100 or higher.

http://www.techtirerepairs.com/tech_...0Issue%202.pdf

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Old 01-22-2009, 01:53 PM   #100
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If rubber valve stems are good to 65 psi, and Marathon tires are good to 65 psi, then I guess its a match made in heaven.

I'm not gonna take my metal valve stems out though.
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Old 01-22-2009, 01:56 PM   #101
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And a metal stem is going to be more durable, especially with a lil extra weight on it spinning down the road at 60 or so.

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Old 01-22-2009, 02:12 PM   #102
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Does that mean I have metal stems on the Marathon tires?
I doubt you have metal valve stems on your Marathons unless they were added post-delivery. And you'd know if you have metal stems...they do not flex like rubber ones do. We installed PressurePros on our rubber stems originally, planning to switch out to metal stems when we got new tires. (So yes, you can use the monitors on rubber stems.)

However, before we needed new tires we had a rubber stem fail. The stem cracked where it enters the rim and it lost pressure down to 14 lbs within seconds. The monitors saved us from a bad situation, thankfully, by alerting us to the pressure loss, and we got off the road before it was completely flat and before the tire itself or the wheel well was damaged. We had the stems switched out on the tires after that. We feel a lot better having metal stems in place.
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Old 01-23-2009, 06:09 AM   #103
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This helps me understand the whole issue better.

I am going to replace them after this trip!
Thanks for the help.
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Old 01-24-2009, 05:23 PM   #104
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New? Tire Pressure Monitoring System

Just got new issues of Highways & RV View. In both I found a Tire Pressure Monitoring System from Hopkins sold under the NVision label. Camping World is selling a 6 tire system for $359 (Club Price).

Anyone have any experience with this system?

See it at:

http://www.nvisionsafety.com/
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Old 01-24-2009, 05:30 PM   #105
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I initially used the PressurePro's with the original rubber stems.

The sensors caused the stems to bend when towing and made marks on the rims.

I had them replaced at a local tire store with metal stems for around $20.

I'd recommend having the stems changed out now because you'll either want to or have to later.
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Old 01-25-2009, 08:17 PM   #106
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Sounds like I need to swap out the stems!

Thank you I get the feeling I will wait and not install them until I
can get the metal stems put on first

I appreciate the advice.
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Old 02-23-2009, 08:26 PM   #107
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Originally Posted by reday View Post
Just got new issues of Highways & RV View. In both I found a Tire Pressure Monitoring System from Hopkins sold under the NVision label. Camping World is selling a 6 tire system for $359 (Club Price).

Anyone have any experience with this system?

See it at:

http://www.nvisionsafety.com/
Received a catalog from local RV dealer today with the NVision Tire Pressure Monitoring System advertised. Anyone try it yet?
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Old 02-23-2009, 08:51 PM   #108
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Have it...

Installed it a couple of weeks ago. I have not had it on the road, but seems to do what it is supposed to do. Installation was straight forward. I would recommend getting air pressure on each tire right before you start. That was the only thing that slowed me down. Nice to be able to cycle through each tire and know exactly what the pressure reading is...
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Old 02-24-2009, 08:36 AM   #109
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I don't know if all brands work the same way, but the Doran 360 and the Pressure Pro sensors have batteries in them. When the batteries die, you have to order new sensors for $50 each. After a trip I remove the sensors so the sensor stops reading pressure and sending a signal. I think this will extend the life of the battery.

I don't know if anyone has found a way to open the sensor (if it can be done) and replace the battery themselves.

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Old 02-24-2009, 10:06 AM   #110
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I don't know if anyone has found a way to open the sensor (if it can be done) and replace the battery themselves.
Gene
Gene, Question?
Any mention in your manual how to program new sensors when the battery goes dead. Wondering what bandwidth they use. Do they offer an
integral metal sensor/valve stem?
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Old 02-24-2009, 11:18 AM   #111
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Bob, I have the Doran 360 and they are easy to program. When I first read the manual, it seemed confusing, but just doing it was quick. I guess when a sensor dies and you get a new one, just go through it again.

I'm unsure what you mean by an "integral metal sensor/valve stem". The sensor is plastic and screws onto the valve stem. My Safari came with rubber valve stems and I think I'd better have them replaced with metal ones soon because of the stress on the rubber from the weight of the sensor revolving gazillions of times. The Doran comes with a locking thing that has very small allen screws that are tightened down to make it difficult to steal the sensors. The principle is ok, but the screws are small and thin and the allen wrench can eat them after a while.

I first had a Pressure Pro, but returned it right away because I couldn't figure out any good way to mount the monitor. Some people have little cubbies in the dash board that can be adapted, or can use velcro to put it on the dashboard. My Tundra has an uneven plastic surface on the dash that makes it hard to use anything on it that sticks to it. The Doran had more options for mounting. I used the 3 suction cups to the windshield system and they haven't budged in almost a year—I've never had anything with suction cups that stayed very long without falling off before.

It works really well though I could use a longer arm to toggle through the different sensors while driving. The only time the alarm has sounded is when the power plug vibrated out of the cheap Y-plug which is attached to one of the 12v outlets.

There are brands where you can add air through the sensor without removing them. At $200 for the monitor and $50/sensor, $400 was all I wanted to spend. The brand that didn't require removing the sensor was another $200, or $600 for 4 tires.

You can get them for the trailer tires only, or buy more sensors for your Suburban too. I think the monitor can handle all the tires on an 18 wheeler.

Gene
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Old 02-24-2009, 02:02 PM   #112
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Gene,
The Burb has the factory tpms, the sensors are built in the metal valve stems.
I got six warranty spares from our parts dept. and would like to figure out a way to use them. Don't think it's gonna happen though.

Bob
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