TPMS--------flow thru or not

WE have the TST system and the guy there recommended we use the flow through on the motorhome and the non flow through on the truck/toad. The reason was because the flow through ones stick out further and are more visible so better not to have them on the toad. We've been very happy with their new system where you can change batteries yourselves.

Here's what I suggest. If your tires and valve stems are easily accessible without removing the hubcap, then use the non-flowthrough design and remove the anti-theft feature of the TPMS. Then it's a simple matter of unscrewing the TPMS by hand just as you would the stem cap. However, if your valve stem is pushing against the hub cap and you'd need to remove the hubcap to service the tire pressure, then I'd get the flow-through type and hope it solves the problem (although it could make it worse). In my opinion, the non-flowthrough is less likely to leak.

Neither should affect tire balance noticeably.

If you use the balancing beads, any additional to the valve stem will be compensated for by the beads. The sensors do weigh something so for perfect balance they need to be offset by some kind of weight.

I just posted a message about using Borg one piece valve stems for the inner dually tires when you add a TPMS. The extra weight at the end of the valve stem added by the TPMS adds to the vibration and can cause valve stem leaks. The one piece Borg stem has a stabilizer that fits in the one of the holes of the rim and stops the valve stem from moving.

I've had both (TST brand...great folks) and nothing but flow through from here on. When you're trying to get the exact pressure with non-flow, you air - take off sensor and check - re-air - etc. etc. I'm lazy and if I have to do all that I take short cuts.

I have the non flow thru TST sensors and the reason is that the flow thru sensors are slightly longer and would extend past the edge of the steel rims on my toad and may cause a problem with hitting a curb or something...

Agree w/ Dennis (Executive)

Personally, I wouldn't want the internal ones though!

The sensors don't weigh enough to upset the balance of the tire.
It's a personal choice as far as flow through or not.

I have the 507 system from TST and it's been worry and problem free for five years/80,000 miles.

They won't upset the OEM internal sensors either.

TST now has internal TMPS also......Dennis
Truck System Technologies