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| Re: [GMCnet] Overloading Tires [message #326062 is a reply to message #326057] |
Thu, 16 November 2017 08:56   |
Richard Denney
Messages: 920
Registered: April 2010
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Of course, the loading is determined by the load rating based on inflation.
The nominal load rating is based on full inflation (80 psi for Load Range
E, as we usually use).
Looking at Goodyear's chart, the maximum load for a light truck tire at 80
psi is 2680 pounds (65 mph top speed). Last I weighed my coach, it was 5725
pounds on the rear. Half of that is 2862, which overloads a fully inflated
E-range tire by 7%. So, if I was facing that eventuality, and had the
capability to lift a dead tire, I would first put the dead tire on the
middle axle (to move the pivot point back and increase the load on the
front tire), and then inflate the good tire to 80 psi. Then, I would go
slow for the minimum possible time (Goodyear recommends no faster than 55
for a 9% overload). Since I don't have those capabilities, I won't worry
about it. :)
I usually run 50 psi in the rear. According to the chart, the maximum rear
tire weight of 1500 pounds for my early, lightweight coach needs 40 psi,
and I add 10 psi for higher speeds, per their chart. At that pressure, the
65mph-limited load is 1765. 2862 is a 65% overload, for which Goodyear
recommends a 10 psi increase in pressure and a 14 mph speed limit. But
because the tire is well below it's rated pressure, I can increase it to 80
psi and have only a 7% overload.
If my rear weight was 2000 pounds per tire (8000 pounds total on the rear),
Goodyear wants me to run 55 psi in the rear, plus the 10 psi for high
speeds. 4000 pounds on one tire (with the other lifted) would be a 50%
overload of an E-range tire at 80 psi. Goodyear suggests I can carry that
load if I inflate the tire above its maximum rated inflation by 10 psi and
limit my speed to 14 mph.
Here's the Goodyear chart, which includes advice for overloads:
https://www.goodyeartrucktires.com/pdf/resources/publications/2010_loadinflation.pdf
Rick "You brought your second purse? Well, dammit, I have to recalculate
all my inflation pressures!" Denney
On Thu, Nov 16, 2017 at 7:54 AM, Ken Henderson
wrote:
> There's not much information here, but the little there is can contribute
> to the recurring discussion of whether to run on one rear tire:
>
> http://rvtravel.com/replace-tires-can-drive-one-dual/
>
> Ken H.
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--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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