Ralph Jones wrote:
O
Can't comment directly on trailers. But my wife's Dodge Caliber
came with sensors as standard. For the first time that I can
recall she has actually requested that I put air in her tire.
Prior to that she has been known to drive for days with almost
zero air pressure.

I think the new sensors are great, on any application.

They are, but it might be an expensive addition to a trailer. The tire
pressure warning system on cars works by comparing the rotational
speeds of all four wheels, and alarming when one wheel's speed is
substantially below the mean. Not too many customers would pay for
speed sensors on all four wheels just for this purpose -- but if your
car has antilock brakes it already has those sensors, and the tire
pressure logic is a trivial add-on.

I believe most cars use actual pressure sensors, rather than the
"indirect" rotational speed method, but I don't have any documentation
for that. The pressure information from the sensor is transmitted
wirelessly. That is how the system I use works. The cost is about $200
for the monitor, and $50 a wheel for the sensor. There are cheaper
systems if you only want to monitor your trailer, but I wanted to
monitor the six motorhome tires in addition to the trailer tires.

--
Eric Greenwell - Washington State, USA
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