Strange thing with tire pressure

[kinimod]

In a recent thread I was wondering why my front left tire always drops from 32psi to 29psi a day after inflating and then stays at 29psi stable, while other tires remain at 32.

I've been measuring that right on start.

Well I warmed up the tires gradually today and they all stabilized at 36psi at 100F eventually, including the one that started off at 29.

How is that possible? Is the mixture of air in that tire behaving differently at ambient temperature? Any hints?

Thanks

[2000cs]

When you fill the tires, do you do that one first, last, or different every time?

[afadeev]

Originally Posted by kinimod

In a recent thread I was wondering why my front left tire always drops from 32psi to 29psi a day after inflating and then stays at 29psi stable, while other tires remain at 32.

I've been measuring that right on start.

Well I warmed up the tires gradually today and they all stabilized at 36psi at 100F eventually, including the one that started off at 29.

How is that possible? Is the mixture of air in that tire behaving differently at ambient temperature? Any hints?

Thanks

Are you using a quality pressure gauge, or playing with iDrive's TPMS readouts?

If the latter, those things are flaky.
My temps and pressures fluctuate unevenly, and way too much to be explained by driving and ambient temperature shifts.

I view the iDrive readout as a form of infotainment, not anything to act on without double checking the readings with quality tools first.

a

[X2Board]

Get a nitrogen fill.

[kinimod]

Originally Posted by 2000cs

When you fill the tires, do you do that one first, last, or different every time?

I always start first with that one. Does that matter?

I measure with iDrive and I actually thought that it's very precise. Even if it's not, the behavior I'm seeing definitely means there's something weird with that one tire -- how it's always at lower PSI when cold but matches other tires when hot.

I was thinking of deflating all tires and inflating with nitrogen but then read the "myth" articles about N2 and supposedly it's just marginally better.