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TPMS: How is it suppose to function?

iamnid

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I have not had a flat in the Rivian, but the tire data seems to update similar to my previous Tesla. The Tesla did alert me twice with totally flat tires within seconds of backing out of a parking space. I would hope that the Rivian would do the same.
It doesn't. I backed out of a spot with a COMPLETELY flat tire with no notification from the TPMS. I was able to get air in the tire so I could drive to a shop to have it patched. I could hear air escaping from the tire and the TPMS still had the values from 8 hours earlier when I drove to work. The shop fixed the tire and I drove about another 5 miles before it ever updated from the 8:00 a.m. values - it was about 7:00pm at that point.

This system will only help you if you start to lose air once the TPMS sensors wake up. For me, that's often 10+ minutes into my drive.
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norivian

norivian

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These sensors and the system itself is but a glorified tire pressure gauge/system.
 

SeaGeo

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godfodder0901

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These sensors and the system itself is but a glorified tire pressure gauge/system.
Oh.. So a Tire Pressure Monitoring System... Crazy.

But the real travesty is that the speedometer is just some glorified speed guage/meter...
 

VSG

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I really don't understand this discussion. Really it was not that long ago that NO vehicles had TPMS. How did we ever survive and detect a flat tire or a low-pressure tire? And without cell phones to call for help or to look up instructions for how to change the tire! A TPMS is a nice-to-have luxury, but c'mon if you have a flat tire or a blowout do you really need a TPMS to tell you that?
 

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R1Thor

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I really don't understand this discussion. Really it was not that long ago that NO vehicles had TPMS. How did we ever survive and detect a flat tire or a low-pressure tire? And without cell phones to call for help or to look up instructions for how to change the tire! A TPMS is a nice-to-have luxury, but c'mon if you have a flat tire or a blowout do you really need a TPMS to tell you that?
It's the same conversation that happens on almost every channel within this forum on a daily.
Entitled people want more. I hate to be crass about it, but it's a bunch of grown ups whining that something isn't exactly what they want, how they want it, when they want it.

I, for one, continue to be extremely grateful for all that my Rivian is. Since the day I took delivery it was better in every single way than every other vehicle I'd owned before it, in spades.
 

Dark-Fx

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I really don't understand this discussion. Really it was not that long ago that NO vehicles had TPMS. How did we ever survive and detect a flat tire or a low-pressure tire? And without cell phones to call for help or to look up instructions for how to change the tire! A TPMS is a nice-to-have luxury, but c'mon if you have a flat tire or a blowout do you really need a TPMS to tell you that?
This is the problem with basically all technology. People become dependent on it, and aren't able to function without it.

One of the biggest reasons I don't like these half-baked "self driving" assists. Once conditions degrade enough, they dump the responsibility back to the user, who is now less experienced, at the worst possible times, because the car has been doing a lot of the work

That said, I still am planning on nerding into the TPMS system on my R1T at some point once the weather improves. Capturing all the sensor broadcasts and power states of the equipment on the truck side. I still believe that the vehicle is either ignoring sensor broadcasts from previously known IDs in order to determine if it's actually "theirs" that should be being used in emergent situations to notify the driver of issues.
 
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norivian

norivian

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āœŒ These sensors are $90 a pop in the gear shop and maybe these breaks often enough to be kept on inventory.

Because I have these sensors, I donā€™t expect to have to circle my vehicle and kick the tires before I drive. We were sold and paid for TPMS - itā€™s not an entitlement (in my opinion).

While we each have different expectations for it, I donā€™t feel we know what functionality Rivian has designed just from responses to this post.

I simply have the same expectation as Tesla TPMSā€¦ and maybe that is Rivianā€™s goal. I donā€™t know and I thought someone here might know. That explains this post. If it is aggrevating to some, my apologies. āœŒšŸ˜Š
 

godfodder0901

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āœŒ These sensors are $90 a pop in the gear shop and maybe these breaks often enough to be kept on inventory.

Because I have these sensors, I donā€™t expect to have to circle my vehicle and kick the tires before I drive. We were sold and paid for TPMS - itā€™s not an entitlement (in my opinion).

While we each have different expectations for it, I donā€™t feel we know what functionality Rivian has designed just from responses to this post.

I simply have the same expectation as Tesla TPMSā€¦ and maybe that is Rivianā€™s goal. I donā€™t know and I thought someone here might know. That explains this post. If it is aggrevating to some, my apologies. āœŒšŸ˜Š
We do know how it works. Rivian TPMS does operate like Tesla. There is a wireless transmitter in the wheel that sends pressure values to a receiver. Since the transmitter is in the wheel, and it spins, it is battery powered. In order to increase battery life, the transmitter shuts down its transmission and sleeps when the wheel is stationary. Once the wheel spins for a period of time, the transmitter restarts its transmission. This is a VERY common way to handle TPMS, the other being a wheel speed difference and some maths.

And regardless of how many electronic do-dads you paid for, you are not absolved of the responsibility to inspect your vehicle. Yes, before every drive.
 

Dave Cundiff

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I really don't understand this discussion. Really it was not that long ago that NO vehicles had TPMS. How did we ever survive and detect a flat tire or a low-pressure tire? And without cell phones to call for help or to look up instructions for how to change the tire! A TPMS is a nice-to-have luxury, but c'mon if you have a flat tire or a blowout do you really need a TPMS to tell you that?
The one time our Rivian TPMS has "sounded the alarm," we were in East Portland and the pressure had just dipped to 37 psi. [We later found out we were losing about two psi per day.] Our drive home was late at night, mostly through remote hilly forests.

At the time the alarm went off, the R1S was still handling normally as far as I can tell.

I'd rather have an early warning about tires, rather than to depend on my five senses. Same with road temperatures near freezing, obstacles before I back into them, etc.

I still think of myself as a good driver. With newer safety equipment, though, I think I'm better and safer than I would have been without it.

Best wishes!

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