Tire Pressure
Elder User
Joined: Apr 2004
Posts: 675
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From: Indianapolis, IN
I'm confused on this. I have stock Pirellis on my '07 F250 SD PSD and the sticker inside the door jamb reads 75 cold PSI all the way around. I checked my tires and they measure 45 cold PSI in all four.
Which should I use? I'm thinking at 75 those tires will swell up and explode!
Which should I use? I'm thinking at 75 those tires will swell up and explode!
Elder User
Joined: Apr 2004
Posts: 675
Likes: 0
From: Indianapolis, IN
Originally Posted by redford
I wasn't aware that Ford's came with Pirelllis as stock?
What size are they and what is the max inflation on them?
What size are they and what is the max inflation on them?
I'll go look at the size and max inflation and report back.
Elder User
Joined: Feb 2004
Posts: 754
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From: Cedar Springs,MI
This also confuses me. I have stock Conti's 275's, 18" wheels. F-350 crew cab, long box diesel. I rarely tow and run what the door sticker says. I think the ride could be better with less air. Any recommendations. Would like the tires to last and keep my mpg up there. Thanks
Junior User
Joined: Nov 2005
Posts: 98
Likes: 0
From: New Hampshire
Originally Posted by preppypyro
Yeah best would be to post your tires, the size and what ply they are. There are a few variating factors, like if your truck is a gasser or a diesel, longbox/shortbox. Whether you haul or tow at all.
Tuned
Joined: Sep 2000
Posts: 417
Likes: 7
From: Olympic Peninsula, WA USA
Originally Posted by Feralhog
Out of curiousity......what difference would it make if it was a gas or diesel truck where tire pressure is concerned? Diesel engine weigh that much more/less?
For guys like me that usually run around with no weight in the bed, the Ford recommended tire pressure that's listed on the door jamb for stock tires is way too much pressure for even tire wear/good traction/and smooth riding. So based on weighing my truck and consulting a tire inflation table from the tire manufacturer, I run the pressure that's required. The key is that I absolutely must raise the pressure before I load my camper, but I'm willing to adjust pressure every couple months so that I have the best conditions at all times.
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Elder User
Joined: Aug 2007
Posts: 571
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http://www.safercar.gov/Tires/pages/TPandLoading.htm
My 2005 SD shows 65psi stickered, but the Nittos Grapplers Ds, the max PSI is 50psi which I am running with. I'd assume 65psi would be disastrous?
Lowering the tire pressure to 40-45 makes for a lot of road noise.
Does the place card compensate for aftermarket tires?
My 2005 SD shows 65psi stickered, but the Nittos Grapplers Ds, the max PSI is 50psi which I am running with. I'd assume 65psi would be disastrous?
Lowering the tire pressure to 40-45 makes for a lot of road noise.
Does the place card compensate for aftermarket tires?
Last edited by FORDSDOWNER; Aug 22, 2007 at 04:04 PM.
Senior User
Joined: Feb 2007
Posts: 201
Likes: 0
From: Royse City, TX
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:
I also added a couple hundred pounds for passengers.
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.
- 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.
I also added a couple hundred pounds for passengers.
Elder User
Joined: Jan 2004
Posts: 685
Likes: 0
From: USA
Thats a good question? What load rang are your tires?
For instance there's no need to run the tire at the max psi if your not carrying the max load.
My last set of load range E tires had max psi of I think 65psi.
For every day driving I would run them at 35psi with no ploblem.
For instance there's no need to run the tire at the max psi if your not carrying the max load.
My last set of load range E tires had max psi of I think 65psi.
For every day driving I would run them at 35psi with no ploblem.
Elder User
Joined: Jan 2004
Posts: 685
Likes: 0
From: USA
Originally Posted by harald
Basically you should run enough air in the tires to support the weight that's on the tire. A diesel engine truck has about 600 lbs more on the front axle, so it needs more air in the front tires.
For guys like me that usually run around with no weight in the bed, the Ford recommended tire pressure that's listed on the door jamb for stock tires is way too much pressure for even tire wear/good traction/and smooth riding. So based on weighing my truck and consulting a tire inflation table from the tire manufacturer, I run the pressure that's required. The key is that I absolutely must raise the pressure before I load my camper, but I'm willing to adjust pressure every couple months so that I have the best conditions at all times.
For guys like me that usually run around with no weight in the bed, the Ford recommended tire pressure that's listed on the door jamb for stock tires is way too much pressure for even tire wear/good traction/and smooth riding. So based on weighing my truck and consulting a tire inflation table from the tire manufacturer, I run the pressure that's required. The key is that I absolutely must raise the pressure before I load my camper, but I'm willing to adjust pressure every couple months so that I have the best conditions at all times.
Freshman User
Joined: May 2008
Posts: 28
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For you guys that have weighed your axles out there, what would be the approximate front and rear axle weight of a stock empty 2004 F250 with a V10 engine?
I'm not anywhere near a set of scales that i could use.
I'm replacing a set of Perilli's 265-75-R16 E with a set of BF Goodrich 285-75-R16 D. Just a note that the BFG 285 D at 3305 lbs @ 65 psi have close to as high as a load rating as the Perilli 265 E at 3415lbs @ 80 psi.
Just need to know the axle weights to set the correct pressures for the new tires.
I'm not anywhere near a set of scales that i could use.
I'm replacing a set of Perilli's 265-75-R16 E with a set of BF Goodrich 285-75-R16 D. Just a note that the BFG 285 D at 3305 lbs @ 65 psi have close to as high as a load rating as the Perilli 265 E at 3415lbs @ 80 psi.
Just need to know the axle weights to set the correct pressures for the new tires.
New User
Joined: Dec 2007
Posts: 10
Likes: 0
Tire Pressure-2006 Diesel Super Cab Long Bed Dual Wheels
I purchased a 2006 F-350 Ford Diesel 6.0 Super Cab with a long bed and dual wheels.
The placard on the door frame has the tire pressure for Lt 245/75R17; Front 75 PSI, Rear 60 PSI.
The truck came with LT 285/70R17 Load E----M+S----Nitro Terra Grappler. Max Load single 3750 lbs; Max Load 3415 for each tire on duals. Each tire has recommended PSI of 80 PSI. The previous owner put 46 PSI in the front tires and 56 PSI in each of the rear dual tires.
What pressure should I have in the tires with no load. What pressure should I have in the tires with a load; and define load.
Any advice is appreciated. Green as grass with trucks and tire pressure.
Ireland92834
The placard on the door frame has the tire pressure for Lt 245/75R17; Front 75 PSI, Rear 60 PSI.
The truck came with LT 285/70R17 Load E----M+S----Nitro Terra Grappler. Max Load single 3750 lbs; Max Load 3415 for each tire on duals. Each tire has recommended PSI of 80 PSI. The previous owner put 46 PSI in the front tires and 56 PSI in each of the rear dual tires.
What pressure should I have in the tires with no load. What pressure should I have in the tires with a load; and define load.
Any advice is appreciated. Green as grass with trucks and tire pressure.
Ireland92834
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v10kenj
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