For the PSI challenged...
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For the PSI challenged...
I was going through some old threads I have saved and found this post:
There is 2 ways you can figure out how much pressure to use. I used "Method 2" and I keep the graph in my glove box for reference. The important thing is to have the tread flat on the ground. Too much air will cause your tires to wear out in the center very fast and too little will cause them to wear on the sides. Either way, they won't last as long as they could. I learned this the hard way with my first set of M/Ts.
Method 1:
Set your truck up with whatever you will have in it most of the time.
Take chalk and put a 4" wide strip across the tread of your tire.
Drive about 50 feet in a parking lot and look at the chalk.
If the chalk is worn off in the center, let out some pressure. If the chalk is worn off on the outsides, add air.
Re-chalk the tire and repeat until the chalk wears off evenly. Then your pressure is correct.
Repeat for all tires.
Method 2:
Set your truck up with whatever you will have in it most of the time.
Go to a public scale.
Get the weight with only the front tires on the scale.
Get the weight with only the rear tires on the scale.
Make a graph (use graph paper) using the "Max Load" data on the sidewall of the tire. (example: Max Load 3,195 at 50 psi) Go up the side of the graph from 0-50 psi and from left to right on the bottom from 0-3,200 lbs. (I rounded up 5 lbs.)
Draw a diagnal line from the 0 psi/0 lbs. intersection to the 50 psi/3,200 lbs. intersection.
Take the weight obtained with only the front tires on the scale and divide by 2 (because there were 2 tires on the scale).
Go right across the bottom of the graph to the weight obtained from dividing the front wieght in half.
Go straight up until you hit the diagnal line.
Go to the left and you will see what your front tire pressure should be.
Take the weight obtained with only the rear tires on the scale and divide by 2.
Go right across the bottom of the graph to the weight obtained from dividing the rear wieght in half.
Go straight up until you hit the diagnal line.
Go to the left and you will see what your rear tire pressure should be.
Adjust your tire pressure accordingly.
This may be a little confusing so I am posting some pics.
I also added a couple hundred pounds for passengers.
There is 2 ways you can figure out how much pressure to use. I used "Method 2" and I keep the graph in my glove box for reference. The important thing is to have the tread flat on the ground. Too much air will cause your tires to wear out in the center very fast and too little will cause them to wear on the sides. Either way, they won't last as long as they could. I learned this the hard way with my first set of M/Ts.
Method 1:
Set your truck up with whatever you will have in it most of the time.
Take chalk and put a 4" wide strip across the tread of your tire.
Drive about 50 feet in a parking lot and look at the chalk.
If the chalk is worn off in the center, let out some pressure. If the chalk is worn off on the outsides, add air.
Re-chalk the tire and repeat until the chalk wears off evenly. Then your pressure is correct.
Repeat for all tires.
Method 2:
Set your truck up with whatever you will have in it most of the time.
Go to a public scale.
Get the weight with only the front tires on the scale.
Get the weight with only the rear tires on the scale.
Make a graph (use graph paper) using the "Max Load" data on the sidewall of the tire. (example: Max Load 3,195 at 50 psi) Go up the side of the graph from 0-50 psi and from left to right on the bottom from 0-3,200 lbs. (I rounded up 5 lbs.)
Draw a diagnal line from the 0 psi/0 lbs. intersection to the 50 psi/3,200 lbs. intersection.
Take the weight obtained with only the front tires on the scale and divide by 2 (because there were 2 tires on the scale).
Go right across the bottom of the graph to the weight obtained from dividing the front wieght in half.
Go straight up until you hit the diagnal line.
Go to the left and you will see what your front tire pressure should be.
Take the weight obtained with only the rear tires on the scale and divide by 2.
Go right across the bottom of the graph to the weight obtained from dividing the rear wieght in half.
Go straight up until you hit the diagnal line.
Go to the left and you will see what your rear tire pressure should be.
Adjust your tire pressure accordingly.
This may be a little confusing so I am posting some pics.
I also added a couple hundred pounds for passengers.
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Posting Guru
Joined: Aug 2007
Posts: 2,440
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Another Method
I found another method to calculate tire pressure using this formula. (From Potomac30)
https://www.ford-trucks.com/forums/6...-pressure.html
https://www.ford-trucks.com/forums/6...-pressure.html
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