Dually tow vehicle tire pressure
Ok. Dually Truck door jamp sticker says rear pressure 65 pounds and front 70. My 5th wheel is 12995 dry and 15000 loaded. I run 80 pounds in rear tires when towing which is maximum rating. I run 70 in...
Forum Discussion
Most duallies tire pressure is rated at the max load on the rear axle. On most newer duallies the tire pressure placard is for max RAWR. So in order to need more than that means you are loading it heavier than the truck is rated for.
At the 65 PSI on the placard what is your RAWR? The 65 PSI is for max load that my truck is rated to haul which is 5445# cargo capacity. On my Ram dually my recommended for RAWR is 65#. This is for a 9750 RAWR. I just weighed my empty truck the day I picked up our new 5er The rear axle weighed in at 3900#. Then on the way home I weighed again with the empty 5er and my rear axle was 5920#. A gain of only 2020#. So at 65 PSI my rear axle was rated to add another 3830 of weight. I know this is an empty trailer weight and I realize that it will go up when I load it up but I still have the 3830# before I even reach the RAWR of 9750# and this is with 65# of pressure. Why would I want to go any higher unless you are over the RAWR?
Go to your tire manufacturer web page and look up their load charts, of course to do this right you need to go and scale your rig so you know where you are at.
Also my front tires are recommended for 80# for a 6000# FAWR.
When I weighed my front weight empty 5080# and loaded weight was 5080#. So my front did not change with the a little over a ton on the hitch in the truck.
I'll not run more than the recommended in fact I would probably lower mine except my on board tire monitor would most likely alarm.
By putting the tire pressure to the max on the sidewall is going to do nothing more than cause a harder ride and wear tires in the center as an over pressurized tire runs higher in the center.
Do the old chalk test, take a piece of chalk and draw a line across the tread and the drive the truck around and see where the chalk wears off. If just in the middle the you have to much pressure. If the chalk is worn off more on the outside than you need more pressure. Try this with the trailer loaded and ready to roll. The bigger the tire patch the better the braking. So if you are over inflating then the center is higher and less contact patch area.
My truck is new and does not have that much mileage on it and it hasn't been in any mud. I can look at my tread on the rears and the outside edges of the tires are not even dirty which shows at 65# my pressure is still to high.
All of this is IMO
At the 65 PSI on the placard what is your RAWR? The 65 PSI is for max load that my truck is rated to haul which is 5445# cargo capacity. On my Ram dually my recommended for RAWR is 65#. This is for a 9750 RAWR. I just weighed my empty truck the day I picked up our new 5er The rear axle weighed in at 3900#. Then on the way home I weighed again with the empty 5er and my rear axle was 5920#. A gain of only 2020#. So at 65 PSI my rear axle was rated to add another 3830 of weight. I know this is an empty trailer weight and I realize that it will go up when I load it up but I still have the 3830# before I even reach the RAWR of 9750# and this is with 65# of pressure. Why would I want to go any higher unless you are over the RAWR?
Go to your tire manufacturer web page and look up their load charts, of course to do this right you need to go and scale your rig so you know where you are at.
Also my front tires are recommended for 80# for a 6000# FAWR.
When I weighed my front weight empty 5080# and loaded weight was 5080#. So my front did not change with the a little over a ton on the hitch in the truck.
I'll not run more than the recommended in fact I would probably lower mine except my on board tire monitor would most likely alarm.
By putting the tire pressure to the max on the sidewall is going to do nothing more than cause a harder ride and wear tires in the center as an over pressurized tire runs higher in the center.
Do the old chalk test, take a piece of chalk and draw a line across the tread and the drive the truck around and see where the chalk wears off. If just in the middle the you have to much pressure. If the chalk is worn off more on the outside than you need more pressure. Try this with the trailer loaded and ready to roll. The bigger the tire patch the better the braking. So if you are over inflating then the center is higher and less contact patch area.
My truck is new and does not have that much mileage on it and it hasn't been in any mud. I can look at my tread on the rears and the outside edges of the tires are not even dirty which shows at 65# my pressure is still to high.
All of this is IMO
