Air pressure
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New User
Joined: Sep 2006
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Air pressure
I'm noticing a rough ride around 60 to 70 miles per hour. I have a 2005 F350 dually. Tires have about 1000 miles on them and have been balanced twice. What air pressures do you run in your tires? Truck has 46000 miles on it. I was told because it is a extended cab instead of a crew cab that is going to ride harsh. My 2003 SD single wheel road alot better. Any ideas? Feels like a vibration in your seat so that usually indicates real area doesn't it?
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
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From: Stephensville WI
Yes, an old tire guy once gave me this advise: If you feel a vibration in the seat of your pants the problem is in the rear of your vehicle. If you feel it in the wheel, it's in the front. If you cannot tell, the vehiicle should not be on the road.
Tuned
Joined: Sep 2000
Posts: 417
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From: Olympic Peninsula, WA USA
I have a dually also and it'll ride very rough if I have the rears aired up to to anything above minimum with no load. I generally run 50 front and 30 rear when unloaded. If you have a diesel, you have about 600 lbs more on the front axle, so you'll need more pressure there. My rears are still overinflated at 30psi if you use tire wear as an indicator, but I don't want to go too low. I only bump the pressures up when I'm carrying a load or towing.
Senior User
Joined: May 2006
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I have mine set at 75PSI. and the ride is pretty good, I could get a 1/2 ton or a car
but then I wouldnt have as much FUN!!!
but then I wouldnt have as much FUN!!!
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New User
Joined: Jun 2006
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With my stock wheels and tires, I had it at 60 PSI. The ride was horibble. With my lift and 37s, the PSI was at 45 and the ride was better but at 35 PSI it rides like a caddy.
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Tuned
Joined: Sep 2000
Posts: 417
Likes: 7
From: Olympic Peninsula, WA USA
Originally Posted by rsauve
On the drivers door, I have a sticker that say both front and rear should be 75PSI
this is a 2006 F250 CC Diesel
this is a 2006 F250 CC Diesel
The best way to set your tire pressures is to weigh the truck and then consult a tire inflation table. You can view tables at www.trucktires.com (don't worry too much about brand because all E rated tires will have the same pressures for a given tire size).
I've weighed my truck and set my empty pressures accordingly (although I fudge on the dually rears because the lowest pressure on the chart is 35 psi and that's still too much for even tire wear). When I load my 4500 lbs slide-in camper, I set all my tires at 55 psi (again I know what each axle weight is and set pressure per the chart).
Junior User
Joined: Jul 2005
Posts: 52
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From: Enterprise, Alabama
[QUOTE]
Not true according to my owners manual on page 134
"ALWAYS inflate your tires to the Ford recommended inflation pressure even if it is less than the maximum inflation pressure information found on the tire. The Ford recommended tire inflation pressure is found on the Tire Label or Safety Complience Certification Lable which is located on the B-Pillar or the edge of the driver's door. Failure to follow the tire pressure recommendations can cause uneven treadware patterns and adversely affect the way your vehicle handles."
Originally Posted by harald
All door jamb stickers are assuming you are going to load each axle to its GAWR (max weight). If you are not carrying any weight and use those pressures, you are overinflating your tires.
"ALWAYS inflate your tires to the Ford recommended inflation pressure even if it is less than the maximum inflation pressure information found on the tire. The Ford recommended tire inflation pressure is found on the Tire Label or Safety Complience Certification Lable which is located on the B-Pillar or the edge of the driver's door. Failure to follow the tire pressure recommendations can cause uneven treadware patterns and adversely affect the way your vehicle handles."
Tuned
Joined: Sep 2000
Posts: 417
Likes: 7
From: Olympic Peninsula, WA USA
[QUOTE=Fort Ruker]
Not true according to my owners manual on page 134
"ALWAYS inflate your tires to the Ford recommended inflation pressure even if it is less than the maximum inflation pressure information found on the tire. The Ford recommended tire inflation pressure is found on the Tire Label or Safety Complience Certification Lable which is located on the B-Pillar or the edge of the driver's door. Failure to follow the tire pressure recommendations can cause uneven treadware patterns and adversely affect the way your vehicle handles."
And it probably says somewhere in the same manual to never exceed the posted speed limit and only replace tires with the same size and brand bought from your Ford dealer and don't drive off road because you might get stuck.
Of course they are going to say that because of liability concerns and to keep it simple for the average uneducated driver. But if you read what the tire manufacturer says, you'll see that a "one size fits all" approach is not best for tire performance. I guarantee you that if you run all 4 rears on a dually at the Ford recommended 60 psi, you'll have a truck that has less traction and will wear out the center of the tires prematurely.
Check this link for a good article:
http://www.firestonetrucktires.com/u...ire_tips_3.asp
Not true according to my owners manual on page 134
"ALWAYS inflate your tires to the Ford recommended inflation pressure even if it is less than the maximum inflation pressure information found on the tire. The Ford recommended tire inflation pressure is found on the Tire Label or Safety Complience Certification Lable which is located on the B-Pillar or the edge of the driver's door. Failure to follow the tire pressure recommendations can cause uneven treadware patterns and adversely affect the way your vehicle handles."
Of course they are going to say that because of liability concerns and to keep it simple for the average uneducated driver. But if you read what the tire manufacturer says, you'll see that a "one size fits all" approach is not best for tire performance. I guarantee you that if you run all 4 rears on a dually at the Ford recommended 60 psi, you'll have a truck that has less traction and will wear out the center of the tires prematurely.
Check this link for a good article:
http://www.firestonetrucktires.com/u...ire_tips_3.asp