First question... Should I run all four ties at 80 psi which is the rated pressure??? I pull an 11k travel trailer. The door reads 60psi in the front and 70psi in the rear for heavy hauling. What am I hurting.

 

Your tires achieve their max weight rating at max air pressure. Look at your sidewalls and do the math compared to your gross weight on the truck.

 

80 will get you the best mileage too. Empty you could get away with 60 in the rear, but I always run 80 in the front because the engine puts alot of weight on the tires.

 

They are a little more stable at 80psi but also ride a little rougher. My 96 and 92 with 33x12.50 BFG MT are load range D and have a 55psi max but I have pulled a 32ft goose neck with a 16,560lb lift on it and they did great. It all depends on the tire and load. you should be fine with what the door sticker says. Pulled this 12,400lb Case tractor + 2 rockwell axles 275miles the same way with no probs. I looks bad with my 2" spacers in the front, it would sit level with out them. The tires in this trailer are G raited and hold 110psi. you just have to see what the tire is rated for. Some big D range tires are rated for more than some E range tires.

 

True, but you are NOT loading your tires to max capacity on the front.

If you were loading your tires to max capacity, you'd be WELL over your GVWR.

Your front tires are ~3400# each load capacity. That's 6800# on just the front axle! You won't have that much weight on the front end--ever.

The front never needs to be over 65psi, imo.

The rears have to be inflated to match the load. With very high tongue weight, you can be approaching the upper range.

I'd run the rears as high as 80psi if I had 2K in the bed or as tongue weight. Otherwise, you don't need that much pressure.

That said, consider this:

--- Overinflating is generally safer than underinflating for the load. The downside is that overinflated tires are more vulnerable to punctures.

--- These tires have a very rigid carcass, and overinflating a couple PSI isn't going to run the center out of the tread. If you're running 70-80psi in the back empty, then the tires will almost certainly wear unevenly. But that's an extreme case. Empty, you can run the rears as low as 35psi or as high as 55psi with no real change in wear pattern (but mpg is better at the higher pressures).

jh

 

So with 950lbs hitch weight I hould be at 80? I dont mind rough ride.

 

Thank you all for the replies.

 

The owner's manual lists alternate pressures for front and rear when running empty. Surprisingly low. I think the pressures listed are 50 front and 45 rear.

 

I run 80 PSI front and rear. Gave me an extra 2MPG. I run this empty, and commuting. Ride is not bad.

 

It depends on which truck you have and which tires. Listed pressures vary for reg cab VS quad cab, 4x4 vs 4x2, and 265 tires vs 245 tires.

My truck with 265s says 45F/40R, with 10psi added to each for sustained operation at hwy speeds.

It's in the insert near the tire warranty info, so it's not in "the manual" per se-- but it's in the vinyl thing that contains the manual and warrant info.

jh

 

Are we talking just the Michelins or anything rated for 80psi?

 

That seems very low to me. Anybody else? Bronco had recommended 68 front and back to me in a different thread. Seems logical.

 

I run what the mfg says not the max rating on the tire. Tow a 10k# trailer with at least 1k# on the hitch and never use 80#. For me the ride is a lot rougher unloaded to run high pressure in tires. I can run 55/45 unloaded and the ride is much better for me, and just add the recommended air to tow.

 

The door on my truck list 60F/45R unloaded, 60F/75R heavy. I run them at 60F/60R and it works well for both empty and when towing my flatbed car trailer with the Jeep on it. However once I get a camper, I'll run the rear at 75-80psi when hauling both the camper and the Jeep. i agree with what some of the people here have said, it's better to run them a little high and have a slightly rougher ride, then to run them low and risk damage to the tire.

Scary thing is when I got the truck I found the dealer had it at 45F/45R!

 

Might try the 80/80