Tire Pressure Monitoring Systems (TPMS)

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As new RV owners, we were very concerned about tire pressure and failure on tires. After some research we found this to be the best deal and proven in the RV world to do what it says, reporting your tire pressure and temperature.
The whole set came in an attractive box with the right amount of sensors including a mounting bracket and power cables.

Features:

  • Large LCD screen. Built-in rechargeable lithium battery
  • Automatic backlight.
  • Configurable high/low-pressure warnings.
  • Configurable high-temperature warnings.
  • Visible and audible alerts.
  • Selectable pressure units.
  • Monitors up to 26 tires maximum.
  • A Booster/Repeater can be added to overcome electronic interference and distance challenges.
  • Per-axle measurements can be configured on the monitor.
  • Driving with or without a toad using two buttons on/off

NOTE: There is a new color monitor available but it seems that the screen is just to dim to read during daylight.

Setup was easy but you have to read the manual! (I know a daunting task) I did set it up at my desk after numbering the sensors. 6 of the sensors were mounted on my 40 foot RV and 4 on the towing vehicle. I did not use the anti-theft shell and tools. I used some Permatex 81343 Anti-Seize Lubricant (Available on Amazon) before I put the sensors on my valve stems to prevent corrosion. The valve stems on my RV are metal as that are the advised stems to use. A few minutes after installation the tires did report in with the pressure and temperature so that was fairly quick.
Also the vehicle I tow reported in soon after that.
I mounted the monitor on the windscreen of our RV, somewhere in the middle so my wife can also see it to be sure we pay attention. On our recent 200 miles trip we had a good idea of the working. Naturally, the pressure and temperature went up on all tires.
Surprisingly the right tire of our towed vehicle was the hottest of all the 10 tires. After some tinkering, we notice that the RV exhaust is in front of that tire. We have a Diesel Pusher and the exhaust is very hot. The tire did not get really overheated but was about 10 to 12 degrees more than the other tires of the towed vehicle.
On our day of return, I decided to bring all the tires on the right pressure. Some of them were off a bit. Be aware that you can easily unscrew the metal valve stem with the sensor when you remove them so keep an eye on that. I left one sensor off on purpose to test the scenario that there was no air pressure. The monitor was beeping loud and the red light was on so this was a good test to have trust in this system.
The total length of RV, tow-bar and the towed vehicle is about 60 feet, the monitor reported the tires of the towed vehicle all the time so no issues there. When the batteries get older I might or might not see drop-outs, time will tell.
Conclusion:
Easy to install reliable reporting, great view on the monitor and good for your peace of mind.

NOTE: The batteries are user-replaceable contrary to some other brands.

On Amazon:

 


A tire-pressure monitoring system (TPMS) is an electronic system designed to monitor the air pressure inside the pneumatic tires on various types of vehicles. TPMS report real-time tire-pressure information to the driver of the vehicle, either via a gauge, a pictogram display, or a simple low-pressure warning light. TPMS can be divided into two different types — direct (dTPMS) and indirect (iTPMS). TPMS are provided both at an OEM (factory) level as well as an aftermarket solution.

Source: https://en.wikipedia.org/wiki/Tire-pressure_monitoring_system

EEZTire Tire Pressure Monitoring System – 10 Sensors (TPMS)

  • Monitor Features
  • ■ Reliable and easy to install, Large LCD screen.
  • ■ Built-in rechargeable lithium battery
  • ■ Automatic back light.
  • ■ Monitors up to 22 tires maximum.
  • ■ Configurable high/low pressure and temperature warnings.
  • ■ Long range between sensors and monitor.
  • ■ Visible and audible alerts.
  • ■ Selectable pressure units. 
  • Booster optional but advisable.

$459 on Amazon  (2019)

 

Benefits of TPMS

The dynamic behavior of a pneumatic tire is closely connected to its inflation pressure. Key factors like braking distance and lateral stability require the inflation pressures to be adjusted and kept as specified by the vehicle manufacturer. Extreme under-inflation can even lead to thermal and mechanical overload caused by overheating and subsequent, sudden destruction of the tire itself. Additionally, fuel efficiency and tire wear are severely affected by under-inflation. Tires do not only leak air if punctured, they also leak air naturally, and over a year, even a typical new, properly mounted tire can lose from 20 to 60 kPa (3 to 9 psi), roughly 10% or even more of its initial pressure.

The significant advantages of TPMS are summarized as follows:

Fuel savings: According to the GITI, for every 10% of under-inflation on each tire on a vehicle, a 1% reduction in fuel economy will occur. In the United States alone, the Department of Transportation estimates that under inflated tires waste 2 billion US gallons (7,600,000 m3) of fuel each year.

Extended tire life: Under inflated tires are the #1 cause of tire failure and contribute to tire disintegration, heat buildup, ply separation and sidewall/casing breakdowns. Further, a difference of 10 pounds per square inch (69 kPa; 0.69 bar) in pressure on a set of duals literally drags the lower pressured tire 2.5 meters per kilometer (13 feet per mile). Moreover, running a tire even briefly on inadequate pressure breaks down the casing and prevents the ability to retread. It is important to note that not all sudden tire failures are caused by under-inflation. Structural damages caused, for example, by hitting sharp curbs or potholes, can also lead to sudden tire failures, even a certain time after the damaging incident. These cannot be proactively detected by any TPMS.

Decreased downtime and maintenance: Under-inflated tires lead to costly hours of downtime and maintenance.

Improved safety: Under-inflated tires lead to tread separation and tire failure, resulting in 40,000 accidents, 33,000 injuries and over 650 deaths per year. Further, tires properly inflated add greater stability, handling and braking efficiency and provide greater safety for the driver, the vehicle, the loads and others on the road.

Environmental efficiency: Under-inflated tires, as estimated by the Department of Transportation, release over 26 billion kilograms (57.5 billion pounds) of unnecessary carbon-monoxide pollutants into the atmosphere each year in the United States alone.

Further statistics include:

The French Sécurité Routière, a road safety organization, estimates that 9% of all road accidents involving fatalities are attributable to tire under-inflation, and the German DEKRA, a product safety organization, estimated that 41% of accidents with physical injuries are linked to tire problems.[citation needed]

The European Union reports that an average under-inflation of 40 kPa produces an increase of fuel consumption of 2% and a decrease of tire life of 25%. The European Union concludes that tire under-inflation today is responsible for over 20 million liters of unnecessarily-burned fuel, dumping over 2 million tonnes of CO2 into the atmosphere, and for 200 million tires being prematurely wasted worldwide.

 

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