Tire Pressure
Elder User
Joined: Dec 2006
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You mean totally unloaded, 6686L?
HI MONST. NOPE, ON THE RARE OCCASIONS WHEN I USE THE X AS A CAR, I DUMMP THE AIR DOWN TO 40 PSI. ITS PRIMARY PURPOSE IS TO SERVE AS A TOW VEHICLE. OUR BOAT AND ITS TRAILER AND THE TRAILER WE ARE USING AT THE MOMENT TO TAKE OUR 6,000 lb PACKARD V-12 TO A CAR SHOW, EACH HAVE A TOTAL WEIGHT OF AROUND 11,000 LBS. If you are unclear why anyone would run more than 55lbs then you need to learn a bit more about tire pressures & loadsI A.MONST-I AM WILLING TO LEARN. AGAIN, NOT CLEAR WHAT BENEFIT THERE IS TO GOING MUCH OVER 55 LBS.
HI MONST. NOPE, ON THE RARE OCCASIONS WHEN I USE THE X AS A CAR, I DUMMP THE AIR DOWN TO 40 PSI. ITS PRIMARY PURPOSE IS TO SERVE AS A TOW VEHICLE. OUR BOAT AND ITS TRAILER AND THE TRAILER WE ARE USING AT THE MOMENT TO TAKE OUR 6,000 lb PACKARD V-12 TO A CAR SHOW, EACH HAVE A TOTAL WEIGHT OF AROUND 11,000 LBS. If you are unclear why anyone would run more than 55lbs then you need to learn a bit more about tire pressures & loadsI A.MONST-I AM WILLING TO LEARN. AGAIN, NOT CLEAR WHAT BENEFIT THERE IS TO GOING MUCH OVER 55 LBS.
Post Fiend
Joined: Oct 2002
Posts: 11,314
Likes: 4
Short and sweet answer ?
the load rating on tires are only at the max pressure....
anything less than max pressure and the load rating is lower...
just as an example...(haven't done the math)
but say your load rating is 3000 @ 100 psi, and you drop to 90 psi (90% of what it was)
then your load rating COULD be down 10% to 2700 @ 90 lbs....
so round #'s if you tow 11k, then that would put you from 12k load rating to 10.8K (just as an example)
the load rating on tires are only at the max pressure....
anything less than max pressure and the load rating is lower...
just as an example...(haven't done the math)
but say your load rating is 3000 @ 100 psi, and you drop to 90 psi (90% of what it was)
then your load rating COULD be down 10% to 2700 @ 90 lbs....
so round #'s if you tow 11k, then that would put you from 12k load rating to 10.8K (just as an example)
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Originally Posted by Originally Posted by Monsta
If you are unclear why anyone would run more than 55lbs then you need to learn a bit more about tire pressures & loads
Since you tow a heavy load you should know your axle weights when loaded. Below is a chart for E-rated tires and the inflation they should be to support the weight.
Keep in mind this is just a guide. Higher pressures (above 55) will serve to stiffen the sidewall which will help with handling, and especially emergency swerve maneuvers and braking.
weight/pressure
1921 / 45
2134 / 50
2348 / 55
2561 / 60
2775 / 65
2988 / 70
3202 / 75
3415 / 80
If you truly want to know the pressures you should run, you need to take your truck to a scale when loaded.
You should also never go below the recommended pressures of 45F / 55R when using your truck "as your car" and traveling legal highway speeds. At 40psi, the tires will only be "rated" to hold about 1700lbs. And that's right on the line of your DRY weight.
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