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The primary seal is actually the cap - the air valve is the secondary one. Cheap caps do not have an o-ring or other very flexible gasket in them, so they need to be tight. I've not had that problem with my OEM ones. What you do not want on any tire stem with TPMS (metal) valve stems is to use a metal cap, but not all caps have a good gasket in them, or it could have some dirt or other debris on them, which can affect their ability to seal. A metal cap on a metal stem will often corrode, and you can't get it off, or if you do, the threads become damaged.Not all countries use the active TPMS and come with a version that relies on the ABS sensor - a low tire will have a smaller effective diameter because it becomes distorted, and that is what triggers the sensor.It's a good idea to reset the TPMS once you've adjusted the air pressure to the desired level...it looks for a variation from that, and if that's not set, it won't register properly. I've found that the readout on one of mine is off a little from my digital gauge, but the other three are right on, so I do not believe it is the gauge but is the TPMS.
The primary seal is actually the cap - the air valve is the secondary one. Cheap caps do not have an o-ring or other very flexible gasket in them, so they need to be tight. I've not had that problem with my OEM ones. What you do not want on any tire stem with TPMS (metal) valve stems is to use a metal cap, but not all caps have a good gasket in them, or it could have some dirt or other debris on them, which can affect their ability to seal. A metal cap on a metal stem will often corrode, and you can't get it off, or if you do, the threads become damaged.
Not all countries use the active TPMS and come with a version that relies on the ABS sensor - a low tire will have a smaller effective diameter because it becomes distorted, and that is what triggers the sensor.
It's a good idea to reset the TPMS once you've adjusted the air pressure to the desired level...it looks for a variation from that, and if that's not set, it won't register properly. I've found that the readout on one of mine is off a little from my digital gauge, but the other three are right on, so I do not believe it is the gauge but is the TPMS.
