they cost $10.00 for a set of 4 @ Autozone.

i pressure my tires 33 all around & use a 36 psi tire minders.
reasoning: when presure drops 4 psi below the rated minder value the minder changes color to yellow, and red 10 psi below. this will alert me at 32 psi (and red @ 26 psi - not recommended to wait that long)

ohhh.. thats useful... especially in all season cities.

The tire minder thing is a good idea, but does it look okay hanging out that far off your tire?

Have you tested these for accuracy???

Curious......

g.r.

they are only 1" total length, but part of this (about 1/4" threads into the valve itself) so youre talking only about 3/4" additional protrusion.

just for cosmetics purposes, id prolly leave em on my car when its parked overnite and then check em in the morning and replace em right after.

if i knew how, i would. i need special a fixture to do this.
i just have to trust the manufacturer on this - just like the pressure gauges you buy.

I would think if you use a tire pressure gauge to check it at different colors illumination you could get a ball park accuracy.

If the pressure read from the tire gauge is the same as the trigger values (for the 36, trigger at <32 and <26) then you could say its accurate.

If you are going to do that you might as well check the pressure with a gauge.

Any concern that the extra weight will cause pressure on the valve stem? How noticable are they, I was thinking about getting some because I am lazy.

These things look like a good idea...as long as they dont get ripped off...I may get a set too...

Do you have a photo of them on your car? Not a close up, but kind of side view so we can see how noticeable they are?

Thanks!

I remember reading something (I think in one of my car mag's) that they're a good idea, but they don't seem to chg colors until their is a significant loss of pressure. (More than the 4 psi advertised). The article basically didn't recommend them.

But hey, they may be wrong. Keep us posted!

better that than these:
http://www.midnightmoose.com/tireflys.htm

Arrggghhhhh!!!!!!