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Old 09-15-2012, 12:48 PM   #15
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Have the same system. Bought it at Camping World same price. Really like it. PRograming can be a pain but is a good strong system.





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Originally Posted by purman View Post
I have been using "Tire Minder" The sensors screw right onto the valve stem and give you pressure and temp. You can set the pressure warning alarm to what ever pressure you want. They give you extra batteries and will give you new ones if you send them your old ones. It needs no boosting and I have driven a good 25 feet from my trailer and still had them working. (28' AS ) The monitor is small and fits on the windshield with the attachment.

It has rechargeable battery built in and last a few days without charging. It is also expandable to 22 tires. You can put them on your TV or another trailer. You can't put them on the Sequoia though, as it has built in TPS system, and they say it won't work with them. I haven't tried it on my Sequoia to see if its true. I used the system on my last 3000+ mile trip. Loved it. Personally I think putting LT tires on you AS is also a good why to not have to worry about your tires. I just did that after my last trip with 16" rims..


Foot note: Hawkshead and Tire Minder are the same thing with different names. At least thats what it looks like since they look exactly the same.

Ebay has them for $258
TireMinder Tire Minder pressure Monitoring System RV 5th Wheel Motorhome | eBay
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Old 09-15-2012, 04:08 PM   #16
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I like our Pressure Pro System. I bought it from Sen at ProPride.
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Old 09-15-2012, 07:57 PM   #17
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Quote:
Originally Posted by jhfarrar
What did you do for rims; AS or Tire Rack?
They are AS mags I was able to get them from someone on the forums here But a lot of people are getting them online. Tire rack charges a lot to ship stuff their tires are not cheaper when you figure in shipping and mounting.
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Old 09-15-2012, 07:58 PM   #18
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Quote:
Originally Posted by Safari-Rick
Have the same system. Bought it at Camping World same price. Really like it. PRograming can be a pain but is a good strong system.

Yeah I a got mine there too on sale. they were $15 more at camping world when I got them.
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Old 10-15-2012, 05:11 PM   #19
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Did a little research on this and found this one.

I like the flow-thru idea and replaceable batteries. Price seems reasonable considering I just spent $145 for just the four sensors for my wife's Tahoe.

Anyone here try this one?
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Old 10-15-2012, 05:44 PM   #20
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Hawkshead TPS

Do yourself a favor and take a good, long look at the Hawkshead system. I read all the reviews on the Forum, asked a lot of questions, and settled on the Hawkshead.

It has several features I found attractive.

One: you can change the batteries in the sensor yourself using a standard watch battery. Most of the others required you to send the sensor back or replace at the tune of $35 or so for each sensor.

Two: the unit tells you the temperature the tire is running. I thought this was a great feature which could tell me if I had a sticking brake or bearing going bad.

Three: the standard monitor will handle up to 22 (I think that is the number, but it is a bunch) sensors. The others required different monitor models for more sensors, which increased the cost. My tow vehicle has pressure sensors, but thought that would be a good feature if we change tow vehicles and perhaps wished to monitor the tow vehicle tires. I ended up with five sensors and put one on my spare trailer tire. Now I know at a glance the pressure of all trailer tires and no longer have to check each one prior to starting out on the road. Turn on the monitor in the morning you plan to depart, and in about five minutes (while you are disconnecting your water and shore power) it is up and tells you all you need to know about tires prior to departure.

Four: the folks at Hawkshead were outstanding to work with. Could not have been nicer or more helpful.

Five: Cost. It was the most reasonable. I purchased direct from the manufacturer.

Have had the system for about four months now and could not be more pleased. It was very simple to install even for a non-tech guy. Easy to follow instructions.

By the way, this system has sensors which attach to the existing tire stem, no need to remove the tire. And there is an audible warning if you lose tire pressure or exceed the pressure and temperature limits you set when you install the monitors.

Hope that helps you with your decision.
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Old 10-15-2012, 06:23 PM   #21
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I have used the Hawkshead system for three seasons now and it has worked fine for me. I have had no problems with it, nice to be able to change batteries myself in the sensors,and although I have yet to encounter a tire problem (touch wood) it gives a somewhat improved feeling of confidence in knowing that by having the system, plus renewing tires every five years, plus doing a walk around at every stop en route, I am doing all I can to keep the odds in my favour.

Gives me something to do on long rides also to periodially check tire pressures and temps manually with the Hawkshead just to see how things are going back there!

I have however found that sometimes at the start of a trip, it can take a few miles at highway speeds before all teh sensors register - not sure why the delay. I can easily tell which ones have started registering as the others will still show higher temps and pressures from the previous day's driving until they kick in with the new lower figures - until the tires come up to operating temperature once again.

Brian.
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Old 10-15-2012, 07:21 PM   #22
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I believe we should all be aware that unless the sensor is inside the tire, it cannot read temperature. I believe these systems use a formula to calculate pressure rise and ambient temp, and then calculate an internal temp by using the1 PSI= 10*F rise in temp.

If you use your noodle, all of them tell you the temp, if you can do a little math.
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Old 10-15-2012, 08:51 PM   #23
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Quote:
Originally Posted by dznf0g View Post
I believe we should all be aware that unless the sensor is inside the tire, it cannot read temperature. I believe these systems use a formula to calculate pressure rise and ambient temp, and then calculate an internal temp by using the1 PSI= 10*F rise in temp.

If you use your noodle, all of them tell you the temp, if you can do a little math.
Must admit I didn't realize that was how they worked. I figured they did measure temp just by means of heat transmitted via the metal valve stem that they say you must use with these units. I assumed that would be far less accurate than it would be if the unit was inside the tire, but at least you could use it as a relative indication of one tire versus the three others and suspect something might be amiss.

Not disputing at all what you say, but just wondering, do you know for a fact that they just use ambient temp + a calculated temp rise based on pressure increase? There is no indication that I recall seeing on the advertising material that suggest that and so it seems to me a bit misleading on the part of the manufacturer if such is the case.

Thanks for the info ---------- Brian.
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Old 10-15-2012, 09:46 PM   #24
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I have this item for sale in the classified. Orange Electronic P409S Retrofit Tire Pressure Monitoring System I was going to use it on a trailer but sold the trailer instead.
It highly rated and new in the box. $120.
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Old 10-16-2012, 08:06 AM   #25
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Quote:
Originally Posted by Wingeezer View Post
Must admit I didn't realize that was how they worked. I figured they did measure temp just by means of heat transmitted via the metal valve stem that they say you must use with these units. I assumed that would be far less accurate than it would be if the unit was inside the tire, but at least you could use it as a relative indication of one tire versus the three others and suspect something might be amiss.

Not disputing at all what you say, but just wondering, do you know for a fact that they just use ambient temp + a calculated temp rise based on pressure increase? There is no indication that I recall seeing on the advertising material that suggest that and so it seems to me a bit misleading on the part of the manufacturer if such is the case.

Thanks for the info ---------- Brian.
I don't know it FOR A FACT, but a sensor on the stem would be nowhere close to the temp in the tire with the cooling effect on the sensor itself, the stem, as well as the metal wheel. They might use some sort of other algorithm, but pressure rise with some sort of memory of starting point is the only way I could fathom any accuracy in the system, based on my auto industry experience only.

For example, most, if not all OEM auto TPMS sensors shut off after X amount of time not sensing rolling of the tire. They turn on when sensing rotation again. If these systems have that feature, the "starting point" pressure could easily be locked into memory of the head unit and a calculation applied. This new base number could only be accepted after, say, 8 hours of off time. I know mine has a clock and calendar in it for other reasons. My Doran does not readout temp, but I calculate it in my head using this formula. BTW, my estimated interior temps run roughly 35* over the readings of the infrared thermometer readings between the tread blocks.
I would be interested in knowing from you folks, what kind of readings you see on your TPMS units vs. outside temps (ambient).
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Old 10-16-2012, 09:35 AM   #26
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I have tire minder the same system as hawkshead. When I had to move my sensors around on the tires as they where on the wrong tires from putting new tires on. It was cold out and the sensors hasn't been used. And they read the correct temp. It was 45 degrees out, and they all read within 2 degrees of this temp. I'm guessing the air in the tires where the same as the outside air as the trailer had been sitting for two weeks. When I stared driving they started to rise before the tire pressure did.

I have also noticed when traveling that the tires on the south side are hotter than the north, because of the direct sun light. I also confirmed this by touch. Either way I believe the temp is accurate in these two systems and is measured by a temp gave in the sensor not an estimate.
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Old 10-16-2012, 09:46 AM   #27
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Quote:
Originally Posted by purman View Post
I have tire minder the same system as hawkshead. When I had to move my sensors around on the tires as they where on the wrong tires from putting new tires on. It was cold out and the sensors hasn't been used. And they read the correct temp. It was 45 degrees out, and they all read within 2 degrees of this temp. I'm guessing the air in the tires where the same as the outside air as the trailer had been sitting for two weeks. When I stared driving they started to rise before the tire pressure did.

I have also noticed when traveling that the tires on the south side are hotter than the north, because of the direct sun light. I also confirmed this by touch. Either way I believe the temp is accurate in these two systems and is measured by a temp gave in the sensor not an estimate.
Jason,

What you say is correct, but all those variables are predicated by pressure. In other words, yes, the initial reading on a cold tire is the ambient temp. Any rise in heat is directly proportional to a rise in internal pressure. It doesn't matter if it is sun load, a change in ambient, or rolling friction. one psi rise = 10*rise and visa versa. (pretty close, per my observations and per TireRack.com here: Tire Tech Information - Air Pressure, Temperature Fluctuations

Unless a TPMS has an actual sensor inside the tire/wheel assembly, it cannot read direct temp with any accuracy.

And actually, if we want to get picky, the air temp inside the tire is not exactly the same as the tire carcass temp (which is the real issue to be concerned with) at any given time. That's why race teams have temp PROBES which penetrate the tread to get as close to the areas of potentail failure as they can.
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Old 10-16-2012, 09:53 AM   #28
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Quote:
Originally Posted by Tom and Robin View Post
Do yourself a favor and take a good, long look at the Hawkshead system. I read all the reviews on the Forum, asked a lot of questions, and settled on the Hawkshead.

It has several features I found attractive.

One: you can change the batteries in the sensor yourself using a standard watch battery. Most of the others required you to send the sensor back or replace at the tune of $35 or so for each sensor.

Two: the unit tells you the temperature the tire is running. I thought this was a great feature which could tell me if I had a sticking brake or bearing going bad.

Three: the standard monitor will handle up to 22 (I think that is the number, but it is a bunch) sensors. The others required different monitor models for more sensors, which increased the cost. My tow vehicle has pressure sensors, but thought that would be a good feature if we change tow vehicles and perhaps wished to monitor the tow vehicle tires. I ended up with five sensors and put one on my spare trailer tire. Now I know at a glance the pressure of all trailer tires and no longer have to check each one prior to starting out on the road. Turn on the monitor in the morning you plan to depart, and in about five minutes (while you are disconnecting your water and shore power) it is up and tells you all you need to know about tires prior to departure.

Four: the folks at Hawkshead were outstanding to work with. Could not have been nicer or more helpful.

Five: Cost. It was the most reasonable. I purchased direct from the manufacturer.

Have had the system for about four months now and could not be more pleased. It was very simple to install even for a non-tech guy. Easy to follow instructions.

By the way, this system has sensors which attach to the existing tire stem, no need to remove the tire. And there is an audible warning if you lose tire pressure or exceed the pressure and temperature limits you set when you install the monitors.

Hope that helps you with your decision.
FWIW from what I can ascertain, the Hawkshead system is made by Tire Traker which is the one in my link. This one is the latest design w/ the new monitor design. My only concern w/ the flow-thru sensors is the extra weight hanging on the valve stem.

As to the tire temp. discussion, couldn't one simply add air to the tire and see if the temp. reading increases? If it does, then it's calculating temp. from pressure. If it doesn't then it is doing it some other way.
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