Tire Pressure Again
I know this has been discussed before. I could probably figure it out from searching the forum but I am in a rush to prepare for my first camping trip. I am also in a rush since I am going into the tr...
Forum Discussion
I have a 2015 Ram dually, so this is coming from experience (I only have 5000 miles on truck, but its always loaded with pickup camper, 5th wheel RV or motorcycle trailer and I like to run with tire pressure displayed on dash.)
running 80 psi COLD in front, empty or loaded, I will see the pressure raise 7 psi (or more) as tires heat up (less PSI increase when empty). Yes road temps affect this PSI gain, but not as much as weight on tires.
Rear tires: Door sticker shows 65psi loaded for rear. This is because at 65psi, the tires are designed to support the max load for that truck.
If you look up a Tire Pressure Chart you can see What PSI gives you what load capacity.
you will never find a chart for Next tires, but all(most) tires are designed per size and load range.
This chart shows 9880 lbs load for 4 tires of that size inflated to 65 psi. That corresponds with what I would expect the rear of a truck to weigh that was loaded to 14,400 lbs total.
I am an "engineering type" personalty and I use these charts. I run my rear tires PSI based on cat scale results and weight shown in charts. I might sway as much as 5psi higher at most.
the charts don't go below 35psi. I have been running 45psi empty. Sure 45psi shows almost 2x the true rear weight of the truck empty, I just have not had enough time to experiment with going lower yet.
You can also sanity check as follows: at 80psi your front tires will show a pressure increase of several PSI as tires heat up.
Weight causes Heat. As tires heat up, PSI goes up.
But as your empty rear heats up you might see 1 or 2 psi change. Now if you use the PSI for your true rear weight as shown in the charts, you will see the rear tires pressure increase about the same PSI as the front tires as tires heat up.
running 80 psi COLD in front, empty or loaded, I will see the pressure raise 7 psi (or more) as tires heat up (less PSI increase when empty). Yes road temps affect this PSI gain, but not as much as weight on tires.
Rear tires: Door sticker shows 65psi loaded for rear. This is because at 65psi, the tires are designed to support the max load for that truck.
If you look up a Tire Pressure Chart you can see What PSI gives you what load capacity.
you will never find a chart for Next tires, but all(most) tires are designed per size and load range.
This chart shows 9880 lbs load for 4 tires of that size inflated to 65 psi. That corresponds with what I would expect the rear of a truck to weigh that was loaded to 14,400 lbs total.
I am an "engineering type" personalty and I use these charts. I run my rear tires PSI based on cat scale results and weight shown in charts. I might sway as much as 5psi higher at most.
the charts don't go below 35psi. I have been running 45psi empty. Sure 45psi shows almost 2x the true rear weight of the truck empty, I just have not had enough time to experiment with going lower yet.
You can also sanity check as follows: at 80psi your front tires will show a pressure increase of several PSI as tires heat up.
Weight causes Heat. As tires heat up, PSI goes up.
But as your empty rear heats up you might see 1 or 2 psi change. Now if you use the PSI for your true rear weight as shown in the charts, you will see the rear tires pressure increase about the same PSI as the front tires as tires heat up.
