I'm trying to determine the correct tire pressures for my weight and
tires, in preparation for getting the correct set of cross-fires. I
have the weights written down from the previous owner. 13,700 for the
front and 28980 for the rear. That weight for the rear puts me right
off the tire chart! Does anyone know the correct procedure for weighing
the rear axle? ie: tag axle dumped or down/ tags on the scale or off?
Sorry if this is a dumb question.
Tom Sorrentino
Bedford Hills, NY
1987 PT38
Not at all a dumb question, Tom. However, you will
want to weight each tire position, and not focus on
each axle, as the heaviest tire on each axle will
dictate the tire pressure for all tires on that axle.
As we cannot attach items to our messages in our
Yahoogroup, I am attaching and sending you directly, a
good "how-to" on weighing.
John Suter
--- thomas_sorrentino
wrote:
> I'm trying to determine the correct tire pressures
> for my weight and
> tires, in preparation for getting the correct set of
> cross-fires. I
> have the weights written down from the previous
> owner. 13,700 for the
> front and 28980 for the rear. That weight for the
> rear puts me right
> off the tire chart! Does anyone know the correct
> procedure for weighing
> the rear axle? ie: tag axle dumped or down/ tags on
> the scale or off?
> Sorry if this is a dumb question.
>
> Tom Sorrentino
> Bedford Hills, NY
> 1987 PT38
>
>
>
>
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Hi Tom, Neil here, ex AâWeigh We Go, and PT-36 owner; sorry to inform you
but the weights that you inherited are just not adequate. You will require,
at minimum, the three individual axle weights to take an informed stab at
setting tire pressure reasonably close, and by the way reasonably close in
not really adequate. The right answer is to find yourself a friendly truck
weighing service, highway truck stop, agriculture scales, gravel pits or
many others; if none of these are obvious, stop a trucker and ask where you
can have your rig weighed. Have the three axles weighed individually with
your rig setup as you travel; I suggest, full fuel, full fresh water and
full propane but no grey or black water. If the scale operator can
accommodate also have the same three weights with only one side on the scale
(right or left) this will allow you to determine wheel-by-wheel weights
which is exactly what you are seeking.
With these weights available you are now able to determine the heaviest tire
on each axle; use that value to determine the pressure required from the
specific tire manufacturers charts for all tires on that axle. In all cases
round pressure values upward to the next full 5 psi value and in the case of
the front tires you may wish to add 5 psi. Nothing less will do!
In the case of your PT38 you should find your pressures to approximate
115-120psi front, 100-105psi mains and 80-85 psi on the tags. Do yourself a
favor now and do it correct and you will only have to do it once.
Regards,
Neil LeKander
Author âThe RVerâs Ultimate Survival Guideâ
author@...
I'm trying to determine the correct tire pressures for my weight and
tires, in preparation for getting the correct set of cross-fires. I
have the weights written down from the previous owner. 13,700 for the
front and 28980 for the rear. That weight for the rear puts me right
off the tire chart! Does anyone know the correct procedure for weighing
the rear axle? ie: tag axle dumped or down/ tags on the scale or off?
Sorry if this is a dumb question.
[Non-text portions of this message have been removed]
Tom, All the weight-vs-psi hoopla gives a whole new meaning to the
term "Tire Pressure"
The rear set does not have an equalizer spring so each axle should be
weighed individualy. The tag should be pressurized so it wont be
dumping its load share on the other two axles. I keep 110 on the
steer and 100 on the drive and tag. I guess if you wanted to get more
weight on or off of the drive, you could adjust the tag down pressure
(I dont know how to do that). I think tires made today are better
than the older designs so the sidewalls and treads will holdup to more
stress. The charts are not application sensative thus dont factor in
airbag ride and freeway travel. I use the same tires on dumptrucks that
run spring axles, jumpcurbs, go offcamber 8% grades, run over rocks,
turn on cul-de-sacks and balance major overloads. when I wear out the
tread I send the casing in for more meat then move them to the back
(cant put recaps on the steer). I truly feel date and sun damage is
more important.
GregoryO'Connor
94ptRomolandCa
d
--- In
WanderlodgeForum@yahoogroups.com, "thomas_sorrentino"
wrote:
>
> I'm trying to determine the correct tire pressures for my weight and
> tires, in preparation for getting the correct set of cross-fires. I
> have the weights written down from the previous owner. 13,700 for the
> front and 28980 for the rear. That weight for the rear puts me right
> off the tire chart! Does anyone know the correct procedure for
weighing
> the rear axle? ie: tag axle dumped or down/ tags on the scale or off?
> Sorry if this is a dumb question.
>
> Tom Sorrentino
> Bedford Hills, NY
> 1987 PT38
>
Thanks to everyone that replied. I think I've got it straight now.
Tom Sorrentino
Bedford Hills, NY
1987 PT38
--- In
WanderlodgeForum@yahoogroups.com, "thomas_sorrentino"
wrote:
>
> I'm trying to determine the correct tire pressures for my weight and
> tires, in preparation for getting the correct set of cross-fires. I
> have the weights written down from the previous owner. 13,700 for
the
> front and 28980 for the rear. That weight for the rear puts me right
> off the tire chart! Does anyone know the correct procedure for
weighing
> the rear axle? ie: tag axle dumped or down/ tags on the scale or
off?
> Sorry if this is a dumb question.
>
> Tom Sorrentino
> Bedford Hills, NY
> 1987 PT38
>