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Old 09-17-2010, 11:28 AM   #15
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Mike makes a good point about replaceable batteries. I just had my first sensor failure two and a half years after installation and the replacement was $39 as I recall. I sure hope the other nine don't start dropping out!

Being able to air up without removing the sensors would be nice too although we don't find we need to do that very often.

We have not yet experienced the leak alarm as the tires cool off while fueling.
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Old 09-17-2010, 12:09 PM   #16
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You all need to remember one thing on the temperature sensor. The sensor measures the air in the valve stem, which is mounted outside of the tire. In order to have an actuate reading of any material the sensor has to be in contact with that material. Air acts as an insulator. So, IMHO, you are only reading an insulated temperature of the air in the valve stem which is out side of the tire.
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Old 09-17-2010, 12:14 PM   #17
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Quote:
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You all need to remember one thing on the temperature sensor. The sensor measures the air in the valve stem, which is mounted outside of the tire. In order to have an actuate reading of any material the sensor has to be in contact with that material. Air acts as an insulator. So, IMHO, you are only reading an insulated temperature of the air in the valve stem which is out side of the tire.
Is that really true? I thought the sensors which measured temp were mounted inside the tire on the wheel. Not so?
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Old 09-17-2010, 12:35 PM   #18
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I have the SmarTire tire pressure monitoring system and find that on occasion even with my tire pressures right on that my tire temp has gone up and set off and alarm.

On my recent trip home I got caught behind a a road crew stripping the highway for about 2 miles and it was stop and go at a snails pace. When the temp alarm went off my rear inner tires had hit 180 degrees so I pulled off let them cool and waited until traffic sped back up to normal. Hit the road and in short order temps were back to about 135 degrees. In my instance what kicked the temp up was the heat generated by the brakes due to the stop and go traffic over a long period of time at very slow speed. I have also noticed a jump in temp on the inner rear tires when the crown in the road is more pronounced when driving less traveled roads.

My point is just because you have the right tire pressure doesn't mean tire temps will be ok.
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Old 09-17-2010, 01:05 PM   #19
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Is that really true? I thought the sensors which measured temp were mounted inside the tire on the wheel. Not so?
Yes that is true. The unit I was looking at, the temp sensor is mounted inside the valve cap.

If you buy a unit that the temperature sensor is attached to the rim then you will have an accurate reading of that rim.

It is very important that you know the difference while doing your research. You do not want a temperature sensor that is surrounded by air. Unless you want to know the temperature of the air in an air duct.
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Old 09-17-2010, 01:11 PM   #20
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My point is just because you have the right tire pressure doesn't mean tire temps will be ok.
When your tire temps increase, do you find a proportional increase in pressure?
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Old 09-17-2010, 01:12 PM   #21
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Yes, the temp sensor is on the valve stem BUT it seems to work very well. Maybe not as accurate as a sensor inside the tire but what you do is look at it as a reference. I know my front tires are normally in the 95-98* region and my back drive axles are around 110-115* and my tag is around 92*. Those are my reference temps and if they go up from that range then I check things regardless if they are acual temps or not. Don't get wrapped around the axle (pun intended lol) on how accurate the temps are on the TPMS. Use it as a reference and look for a change.

I have also noticed that the inner tires and my drive axle run hotter especially on the curb side and this is the one that normally sets off the alarm when I stop and fuel.
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Old 09-17-2010, 01:32 PM   #22
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I have the SmarTire tire pressure monitoring system and find that on occasion even with my tire pressures right on that my tire temp has gone up and set off and alarm.

On my recent trip home I got caught behind a a road crew stripping the highway for about 2 miles and it was stop and go at a snails pace. When the temp alarm went off my rear inner tires had hit 180 degrees so I pulled off let them cool and waited until traffic sped back up to normal. Hit the road and in short order temps were back to about 135 degrees. In my instance what kicked the temp up was the heat generated by the brakes due to the stop and go traffic over a long period of time at very slow speed. I have also noticed a jump in temp on the inner rear tires when the crown in the road is more pronounced when driving less traveled roads.

My point is just because you have the right tire pressure doesn't mean tire temps will be ok.
I noticed that the SmarTire has Temperature Compensation. This is a nice feature. How does the temp sensor mount to the wheel or is intergrated into the valve cap with the pressure sensor?
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Old 09-17-2010, 01:51 PM   #23
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OneRVer: SmarTire system is mounted inside the tire via a large steel band (looks like a giant hose clamp mounting to inside center of rim). Reads internal temp and tire pressure.
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Old 09-17-2010, 02:08 PM   #24
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OneRVer: SmarTire system is mounted inside the tire via a large steel band (looks like a giant hose clamp mounting to inside center of rim). Reads internal temp and tire pressure.
Ken you need to ask SmarTire for a commission. You have sold me on this product. Have you owned it long?
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Old 09-17-2010, 02:35 PM   #25
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So when the SmarTire sensor battery runs down then you have to take the tire off and break in down and replace the battery. Guys the screw on the valve stem pressures are right on (probably more accurate than most tire gauges) and the temps are close enough for a reference so you know you have a problem.
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Old 09-17-2010, 03:24 PM   #26
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All the systems are not a substitute for checking your pressures manually and
inspecting the tires at every stop. All tire pressure monitors can cause pressure
drops, since they add another potential "leak" to the system.
Check out the professional truckers, they don't use silly systems.
Thats true, but checking your tires is not a substitute for having a monitoring system either. I always check the tire pressure each day, check the tire temperature at each stop with a digital meter, but that didn't stop me from having a trailer tire explode on me. The tire shop said I probably picked up something off of the highway. I haven't got a system yet, but I know that I will have one when I go on my next trip. It may not help, but it sure can't hurt to have one. On a side note, everyone should have a carbon monoxide sensor in their unit. If I didn't have one I wouldn't be here to talk about it. I don't want to see anyone here wake up dead
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Old 09-17-2010, 03:51 PM   #27
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So when the SmarTire sensor battery runs down then you have to take the tire off and break in down and replace the battery. Guys the screw on the valve stem pressures are right on (probably more accurate than most tire gauges) and the temps are close enough for a reference so you know you have a problem.
Mike you make a very good point. The ones that came with my car are seven years old with no battery change. I would hope that SmarTire would be the same.

From what I have read, you should change the motor home tires every six to seven years. So if luck is on your side, you should only have to replace the batteries when you replace your tires.
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Old 09-17-2010, 03:55 PM   #28
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When your tire temps increase, do you find a proportional increase in pressure?

Yes but not enough to have thrown the air pressure code.


I have also noticed that the inner tires and my drive axle run hotter especially on the curb side and this is the one that normally sets off the alarm when I stop and fuel.

I have the giant muffler on the passenger side that can get up to over 800 degrees and the temp light for the exhaust comes on if going less than 5 mph which I also believe impacts the inner tire temp on the curb side.

Battery life roughly 7 years and figure by then will be pulling the tires off due to age or hopefully because of mileage. I've had a couple on my old coach that didn't last that long but company replaced them free of charge but did have to pay the fee for breaking down the tire.

OneRVer: No affiliation with Smartire. I like the system but it is pricey. This is the second coach I've had the system on since 2004 and no complaints.
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