Spare Tire TPMS
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Tuned
Joined: Dec 2019
Posts: 318
Likes: 12
From: Long Beach
Spare Tire TPMS
I just added a 37” spare tire in my bed to match my tires on my truck. I added a TPMS to it but when I got the tire mounted the tire shop said I only have 4 spots to monitor my tire pressure via TPMS. Anyone know a way to add a fifth spot so If I have to change a flat tire I will have that tire monitored? He said that the Rams do it so figured ford would be the same but couldn’t figure it out.
Cargo Master
Joined: Oct 2011
Posts: 2,889
Likes: 779
From: SoCal/Wyoming
You could use the system reset procedure in the owners manual if you are really concerned with the pressure reading with a spare. I don't have one in my spare as I can count on two fingers, the number of times I have had to use a spare in 45 years of driving. If I do need the spare, it’s only on long enough for me to fix or replace the damaged tire.
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Tuned
Joined: Dec 2019
Posts: 318
Likes: 12
From: Long Beach
You could use the system reset procedure in the owners manual if you are really concerned with the pressure reading with a spare. I don't have one in my spare as I can count on two fingers, the number of times I have had to use a spare in 45 years of driving. If I do need the spare, it’s only on long enough for me to fix or replace the damaged tire.
Cargo Master
Joined: Oct 2011
Posts: 2,889
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From: SoCal/Wyoming
Some folks mount there spare upside down so it’s easier to check the pressure but it can be a PITA when you let it down and there is no free space for the carrier. I pull my spare every year and check the cable and make sure it has 60 psi in the spare. I also carry a compressor so I can always add air if needed. As you may carry the 37 in the bed, should be rather easy to maintain.
Mountain Pass
Joined: Nov 2021
Posts: 109
Likes: 70
From: Virginia Beach
In order to keep track of my spare tire’s pressure I put a TST cap sensor on it. While I don’t always have the system up and running, I periodically put it up to charge it and can see where the pressure is. And of course it’s always up when pulling the rolling house. BTW, the TST 770 display is the BEST!
Laughing Gas
Joined: Apr 2021
Posts: 998
Likes: 608
From: Middle TN
Some folks mount there spare upside down so it’s easier to check the pressure but it can be a PITA when you let it down and there is no free space for the carrier. I pull my spare every year and check the cable and make sure it has 60 psi in the spare. I also carry a compressor so I can always add air if needed. As you may carry the 37 in the bed, should be rather easy to maintain.
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Lead Driver
Joined: Nov 2005
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Some folks mount there spare upside down so it’s easier to check the pressure but it can be a PITA when you let it down and there is no free space for the carrier. I pull my spare every year and check the cable and make sure it has 60 psi in the spare. I also carry a compressor so I can always add air if needed. As you may carry the 37 in the bed, should be rather easy to maintain.
My question is why in the world would it lose air pressure sitting unused in the bed???
OEM spare sits up under the bed in the frame for years and doesn't lose pressure, why would this spare laying in the bed lose pressure???
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Cargo Master
Joined: Oct 2011
Posts: 2,889
Likes: 779
From: SoCal/Wyoming
The spare tucked up under the bed does lose pressure over time. Temperature changes between the wheel and the tire and the fact that air permeates rubber over time ensures that air will escape from the spare tire. How much may depend on environmental conditions and age but they will all lose pressure. Many folks go to put on a spare only to find out that it’s flat. It wasn’t initially stored that way, they just never checked it because it was never used and the air eventually escaped. I carried a 37 in my bed for a long time and while it was never flat, I did top it off every now and then to make sure it was ready if I needed it.
Laughing Gas
Joined: Sep 2017
Posts: 1,144
Likes: 273
From: Southwestern Pa.
The spare on our camper loses air pressure over time, to a greater extent than my truck's spare. I carry a Viair air compressor in the truck, along with a bottle jack, a couple of wood blocks, a jump box, a kinetic rope and several soft shackles. Better to be ready than needy.
Lead Driver
Joined: Nov 2005
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Well, I had to use the spare on my truck once, had been up under there since new, and was at about 2.5 years in, and while it may not have been aired up to 75 it had enough to use without having to air it up.
But, seems to me that the OP will be spending quite a bit of money and effort to make it so he doesn't have to get his tire gauge out and manually check his spare every few months.
But, seems to me that the OP will be spending quite a bit of money and effort to make it so he doesn't have to get his tire gauge out and manually check his spare every few months.
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