powerboatr
living well in Texas
empty dually
60-65 up front
40-45 rears
loaded
65-70 up front
rears based on load across axles
45 and ^
a great rule of thumb is if your not going to be LOADED all teh time and can take the time to air up or down depending on load.
is to air up the tires based on load
most mfg have this info on their site. mich and good year bfg
but
the fronts like its been said are HEAVY , so run em up near max
i like 60-65 but ech tire is differnt based on plies and construction
so if you start at say 60 psi then lay a flat ruler across the tire tread at the top.
the tread should be just north of concave.
then look at the tread contact at the ground, (it helps to be on flat concrete for this)
the tread should be even across, the middle and edges should share the contact with the road.
if the center is touching but the outer edges are not, then your running to high of a pressure based on the load.
this will not be to detrimental except you wear out the center tread grip surface faster than the edges
and is the edges are touching and the center is not, then your UNDER inflated and this is bad for tire life and safety.
a note about fronts on 2wd trucks (ford) the twin i beam setup is hel l on front tires
it wears in a weird odd ball pattern
bad or weak shocks will cause them to scallop the outer edges, and if your driving like #3 the outer edges will wear right over into a nice curve and eat up your rubber
its very important to air up the fronts to keep a nice slighty more raised center tread when measured at the top.
all you guys running oversize tires and wheel
your on your own.. follow the recomend psi from the wheel company and tire manuf.
i know for a fact my last set of mich atx 10 ply 16's i ran with 30 psi out back empty and they wore very envenly
dually trucks can run at very low PSI empty because of the load share between four tires.
a 2400 lb tire at 80 psi theoreticlly balances out to 30 pounds carried for each psi .
wow wrote more than i thought
one more disclainer
tires above 18" wheel diameter, are a whole nother ball of wax
20's are rated at less capacity and proper air pressure is VERY VERY important. with less sidewall to absorb the load surges.
http://www.rma.org/tire_safety/tire...y_brochure/tire_care_and_safety.cfm#inflation
great article
60-65 up front
40-45 rears
loaded
65-70 up front
rears based on load across axles
45 and ^
a great rule of thumb is if your not going to be LOADED all teh time and can take the time to air up or down depending on load.
is to air up the tires based on load
most mfg have this info on their site. mich and good year bfg
but
the fronts like its been said are HEAVY , so run em up near max
i like 60-65 but ech tire is differnt based on plies and construction
so if you start at say 60 psi then lay a flat ruler across the tire tread at the top.
the tread should be just north of concave.
then look at the tread contact at the ground, (it helps to be on flat concrete for this)
the tread should be even across, the middle and edges should share the contact with the road.
if the center is touching but the outer edges are not, then your running to high of a pressure based on the load.
this will not be to detrimental except you wear out the center tread grip surface faster than the edges
and is the edges are touching and the center is not, then your UNDER inflated and this is bad for tire life and safety.
a note about fronts on 2wd trucks (ford) the twin i beam setup is hel l on front tires
it wears in a weird odd ball pattern
bad or weak shocks will cause them to scallop the outer edges, and if your driving like #3 the outer edges will wear right over into a nice curve and eat up your rubber
its very important to air up the fronts to keep a nice slighty more raised center tread when measured at the top.
all you guys running oversize tires and wheel
your on your own.. follow the recomend psi from the wheel company and tire manuf.
i know for a fact my last set of mich atx 10 ply 16's i ran with 30 psi out back empty and they wore very envenly
dually trucks can run at very low PSI empty because of the load share between four tires.
a 2400 lb tire at 80 psi theoreticlly balances out to 30 pounds carried for each psi .
wow wrote more than i thought
one more disclainer
tires above 18" wheel diameter, are a whole nother ball of wax
20's are rated at less capacity and proper air pressure is VERY VERY important. with less sidewall to absorb the load surges.
http://www.rma.org/tire_safety/tire...y_brochure/tire_care_and_safety.cfm#inflation
great article
Last edited:
. I'm sure everyone remembers the "Rolling Explorer" incident, where Ford blamed Firestone for the tire failure and somehow won a lawsuit against them!?!?!
(Firestone has been making tires as long as Ford has made cars.The two companies had almost a 100 year history of tire contracts.) Ford was trying to get a "smoother" highway ride out of their vehicle by using less tire pressure.(I'm not knocking the company, I own two Fords. Just questioning their judgement.) I personally owned Firestone Wilderness A/T's that I had on a Toyota 4-Runner, they were the longest wearing, best AT tires I've ever owned. Not so much as a nail puncture in 70,000!! Sorry, getting off topic
...anyway...My 
go by 
