From time to time this subject has come up.
I had an interesting<?> thought. Why doesn't someone come out with a gauge
that you push against the side of the tire that measures the deflection?
Beats removing a cap and fooling with a fussy tire air pressure gauge. It
might need to be calibrated by the user with a regular gauge depending on
type of tire. I'd buy one (if it didn't cost an arm and a leg).
What do you think?
You know it's time to clean the refrigerator
when something closes the door from the inside.
I think it would be difficult to calibrate and have a cost considerably
higher than a $2.95 Slime pencil type tire gauge. I picked the Slime brand
because a review in a motorcycle magazine, where people tend to be less
casual about tire pressures, found it as good as any and better than most,
including the upscale digital models.
The industry is one step ahead of that.
A friend of mine bought a /used/ car and it has built-in tire pressure
sensors. She got a warning when one of the tires was low.
Since the car was used, that means the technology must have been around
for a while now.
Wife's car has these sensors. One went bad and showed tire to be under
inflated when it was inflated to the proper pressure. Dealer charged
$100 for a new sensor and $100 to put it in. I would have been tempted
to put a piece of masking tape over the red warning light. I have the
same model car but older without the sensors and I've never been worried
I rented a Toyota that had a screen that showed the pressure of each
tire. Warning light came on but did not say which tire and I had to
check them all with my gauge. Being a rental car, they varied by about
Our masters in DC have mandated this. Can't wait for the mandated
backup camera - more expensive shit to go bad.
Probably close to 10 yr if not longer; not sure whether it's yet in the
"mandatory" column for new or not but haven't had a vehicle without it
since an '06 model LeSabre that had them.
The '06 was the "one is bad, not indication of which" variety of
indicator but all since all have at least an indication of which but
since '10 all have digital readout on each tire.
I've yet to have one go bad with four vehicles and a combined mileage of
probably >500k as a group, so in my mind they're _a_good_thing_ (tm) and
well worth the relatively small initial cost.
Somebody brought up the rear camera -- it's in the '10 Enclave and I
find it of little real value. I suppose if one had small kids it would
have a chance of saving a backup incident but I've had the vehicle for
five+ years now and I rarely, if ever, actually look at it. The backup
IR sensors are excessively sensitive and somewhat annoying; if I had
only a little more ambition I'd find the location of the beeper and put
something over it to mute them significantly. I suspect in an instance
or two over the life of a vehicle they'd have the possibility to prevent
a fender crunch but are exceedingly irritating trying to parallel park
in a tight spot as they start alarming far too far away from actual
impact. That _could_ be tuned; others may be better...
On Friday, December 12, 2014 9:00:40 AM UTC-8, dpb wrote:
Yes, it is mandatory and has been for several years. The other "nice" part is if you run two sets of mounted tires (winter/summer), the second set also has to have them and that runs big bucks.
Don't see why that is a "must", necessarily. Of course, the system
won't function correctly without them, but don't see anything that would
make it mandatory.
I've not run a second set of rims on a passenger vehicle in at least 40
years; doubt if there's one in ten-thousand that do...
I was visiting a friend who had bought a new pickup at about that time,
and it had one like that. The light came on and he checked all 4 tires
on the ground. None of them were low. It was the spare tire.
On this pickup, the spare tire is mounted under the bed, with the valve
up (and so inaccessible), making it hard to check. He put it back on
with the valve down.
BTW, is these some benefit to having the valve up (and hidden)?
12 days until the winter celebration (Thursday December 25, 2014
12:00:00 AM for 1 day).
Now, w/o a full-size spare, not sure any have the sensor in the
spare...and don't think have ever had one even with the full-size rim
that had it in the spare. Certainly never had any indication of such on
any vehicle I've had (bunch of GM and one Chrysler in the lot).
Other than possibly minimizing vandalism and the very rare chance of a
thrown rock or the like damaging the stem can't think of any. Altho
I've had some that the hanger would only allow the rim to sit that way
as the centering portion was too high for the recess otherwise. OTOMH
can't think of which way any of the current three are...haven't had to
use the spare in years (which is actually quite an unusual occurrence
come to think of it with the number of flats get from stuff in the dirt
road that gets turned over almost every time they grade them. Of
course, the car tires aren't as rugged so small stuff that gets them
doesn't always actually cause a puncture in the trucks...
On Friday, December 12, 2014 at 10:16:43 AM UTC-5, philo wrote:
It has but I would not rely on it unless you have an actual pressure readou
t in real PSI. a "Low Tire" warning just means that the tire has 75% of th
e door sticker pressure, I'd prefer to know before that point.
N8N wrote: "It has but I would not rely on it unless
you have an actual pressure readout in real PSI.
a "Low Tire" warning just means that the tire has 75%
of the door sticker pressure, I'd prefer to know before
that point. "
Lucky you! The TPMS on my car were calibrated to
-5psi below the maximum pressure on my TIRES(41psi).
My door sticker says 30psi all four, so even if I keep
them at 32psi, my tires are still 'underinflated' according
to some guv'mint gadget installed in them! So I
just drive around and ignore the light.
The deflection of the tire sidewall is not the most accurate indicator of proper/over/underinflation.
Semi-OT: Has anyone seen that TV commercial where viewers are given 3 choices as to how much oil could be saved if everyone in America kept their tires properly inflated? I believe the correct answer was in the billions of gallons. Sobering!
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