99 dually tire pressures?
#1
99 dually tire pressures?
The door jamb sticker on my 99 is un-readable, where the tire pressures are listed. Would any of you guys be able to check your stickers and tell me what the factory wants the duals inflated to? I have the factory 16" steel wheels, with LRE tires. I just want to be sure I have it right, for when I'm towing the fiver.. Thanks!
#2
#3
Thanks Frank...
I am running 235-85/16's all the way around, on mine. Maximum sidewall pressure is 80PSI, but I believe that is for SRW only. I know duals are different, I just don't know what Ford wants in them...
#5
Well, I just looked at my door sticker.
I have no idea who would actually run these numbers in their tires, but it sais 60psi in the fronts and 45psi in the rears.
I would follow the tire manufacture, before I went with those numbers.
I dont understand why they even print tire psi on the door stickers, Its only good for the tires that came on the truck when new.
We have come along way with tire technology in the past 12 years.
I have no idea who would actually run these numbers in their tires, but it sais 60psi in the fronts and 45psi in the rears.
I would follow the tire manufacture, before I went with those numbers.
I dont understand why they even print tire psi on the door stickers, Its only good for the tires that came on the truck when new.
We have come along way with tire technology in the past 12 years.
#6
#7
I've had pretty good luck in the wear dept with em.
Have em on the 5'r as well.
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#8
I looked up my tire size in the load and inflation table..
Running LT235/85R16 as duals, 50PSI gives me 2006lbs weight carrying capacity per tire.
65PSI in the duals, gives an extra 375lbs. per tire at 2381lbs.
80PSI in the duals, gives an extra 772lbs. per tire at 2778lbs.
Since the heaviest load my dually carries is my fiver, 50PSI works. I carry around 3500lbs. in the bed while towing.. That's including the auxiliary fuel tank, the water tank for my water injection, the actual pin weight of the fiver and the miscellaneous other crap in the bed. The truck has a rear gross axle weight rating of 6800lbs. and the tires themselves are capable of carrying 8024lbs. at 50PSI. I think I'm good
Running LT235/85R16 as duals, 50PSI gives me 2006lbs weight carrying capacity per tire.
65PSI in the duals, gives an extra 375lbs. per tire at 2381lbs.
80PSI in the duals, gives an extra 772lbs. per tire at 2778lbs.
Since the heaviest load my dually carries is my fiver, 50PSI works. I carry around 3500lbs. in the bed while towing.. That's including the auxiliary fuel tank, the water tank for my water injection, the actual pin weight of the fiver and the miscellaneous other crap in the bed. The truck has a rear gross axle weight rating of 6800lbs. and the tires themselves are capable of carrying 8024lbs. at 50PSI. I think I'm good
#9
The only thing that concerns me about lower pressure is sidewall flex causing the tire to heat up.
I may be wrong about that. but I like to keep the rears at 75-80 for that reason.
I cannot feel a difference in ride quality when the pressure is lower anyhow. The reason I say that is because I got new rear tires while working in Texas, and didn't realize they put 50 psi in em till I double checked em before hooking up the camper for the trip home 2 months later.
I may be wrong about that. but I like to keep the rears at 75-80 for that reason.
I cannot feel a difference in ride quality when the pressure is lower anyhow. The reason I say that is because I got new rear tires while working in Texas, and didn't realize they put 50 psi in em till I double checked em before hooking up the camper for the trip home 2 months later.
#10
Guys, I had heard about the earlybirds stickers saying 60 front and 45 rear on DUALLYS.
Mine is a LATE '99 and it says 60 front and rear.
I generally run 70 psi in the fronts, and have found even with towing my 24' enclosed car hauler trailer and my '65 Mustang weighing just under 7k MY rears run cool at 45psi, I tried to run 60 in the rears and can only get about 2" of road contact on both the inner and outer tires, I was told about the chalk test, did it, and now I run 40psi when I'm empty and 45 when I pull the trailer, I am thinking I'll need to go up a bit when I hook up the new 12k tt though. I run 23585R16E Cooper Discoverer H/Ts, you'll never have any rubbing issues with a stock size tire on a stock wheel on any SuperDuty Dually.
Mine is a LATE '99 and it says 60 front and rear.
I generally run 70 psi in the fronts, and have found even with towing my 24' enclosed car hauler trailer and my '65 Mustang weighing just under 7k MY rears run cool at 45psi, I tried to run 60 in the rears and can only get about 2" of road contact on both the inner and outer tires, I was told about the chalk test, did it, and now I run 40psi when I'm empty and 45 when I pull the trailer, I am thinking I'll need to go up a bit when I hook up the new 12k tt though. I run 23585R16E Cooper Discoverer H/Ts, you'll never have any rubbing issues with a stock size tire on a stock wheel on any SuperDuty Dually.
#12
Inflate your REAR LT23585R16E tires on an EMPTY dually and I absolutely guarantee that you will not realize full tread contact on the road-do the chalk test for yourself.
#13
I too am running the BFG Commerical T/A's in rear and 60psi empty and 75psi when I am pulling. I am very pleased with the tires.
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