View Poll Results: how often do you check your tire pressure?
Monthly, and before every trip towing 21 67.74%
Monthly 1 3.23%
Before towing, or when I get the oil changed 8 25.81%
It's been a while... 1 3.23%
Voters: 31. You may not vote on this poll

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Old 04-30-2004, 09:29 AM   #15
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Thumbs up Added active monitoring

Over the past year, I have been involved in beta testing an active tire pressure monitoring system that is simple to install , very accurate and is now commercially available. The sensors simply replace your existing valve stem covers. Each sensor weights about 1/2oz so it does not effect tire balance in most cases. The sensors are a cylindrical design about 1" tall X 1" in diameter. The system will monitor 6 tires on the trailer and 10 tires on the tow vehicle. The pressure set point is established when you screw the sensor onto the valve stem (ie the existing pressure becomes the setpoint for alarming, but the sensor ALWAYS sends the ACTUAL pressure). If you realize that a tire is low once you have attached the sensor, simple air up the tire and reattach the sensor which will set the new pressure as the setpoint. Each sensor sends a digitally encoded FM signal (better reception and range) to the monitor every 5 minutes if things are normal as well as each time the tires have been sitting for more than 15 minutes and then start rolling. You can also manually trigger a reading by holding a magnet near the sensor for a few seconds. If a tire's pressure drops 12.5% below the setpoint, the sensor sends a reading and the monitor warns you with a simple beep, the actual pressure and a flashing indicator at the tire location in question. If the pressure drops 25%, again the sensor send a reading and the system goes into alarm mode, which is a constant beeping, the actual pressure and the same flashing location indicator. At any time, you can press a button and cycle thru the current tire pressures. The manufacturer (www.advantagepressurepro.com) states that the reception range is in the 100' catagory, so even with a crewcab 1ton pickup or a Burb/Excursion and a 34', the A/S tires would still well within range.

My Bambi tires run a recommended 65PSI cold and at highway speeds have increased to about 72-73PSI. My LT truck tires run 50PSI (when I tow) and increase into the mid 50s. Even with diligent checking before we leaving and at rest stops, there is always the potential for leaks as we travel and catching that situation in time has always been a matter of luck. With active monitoring, checking the pressure on all the tires is a simple matter of pressing a button.

david
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Old 04-30-2004, 10:36 AM   #16
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I always check pressures before and during a trip. I check tire pressures at each fill up. My last trip I caught a slow leak. my trailer tires were @ 69psi hot, but one was @55 psi. I was able to simply fill that tire to 69psi (since it was hot) and keep motoring down the road. I checked the tires the next morning after they had cooled and found that the low tire was within 1-2psi of the others.

Cheap insurance, take the time to check pressure at gas fill ups. BTW- I run my front truck tires @ 65 and my rears @ 75 towing as I carry a lot in the bed of the truck too. My trailer tires are set at 65.

Tripp
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Old 04-30-2004, 01:52 PM   #17
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Quote:
Originally Posted by argosy20
That is correct, Eric. Cold tire pressure is defined as stationary overnight, and not having been driven over 1 mile. I would check before moving it, anyway.Terry
Here is a routine I use if I don't feel like using my 12 volt air pump at home or on the road.

First I check each tire cold in the morning. I note the pressure for each tire and the amount necessary to bring the tire up to recommended inflation. Then I drive to the gas station remeasure the pressure but fill the number of pounds necessary as found in the first measurement.

For example cold at the house the pressure is 30 lbs. Recommended pressure is 35. I drive to the gas station. I check again and now the tire is 32 lbs. I fill the tire to 37 lbs. since I originally was 5 pounds low when cold.

That pretty much accounts for the heat build up and when the tire cools down, it should be pretty close to recommended cold inflation pressure.

Jack
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Old 05-01-2004, 12:43 AM   #18
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In addition to the tire pressure ... don't forget to check the torque on your trailer wheels.

We're out fulltiming ... so we have a small 3 gallon Husky compressor and a torque wrench in the truck.
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