Recommended Tire Pressure?

Running 285 75r16s and just aired down to 35. Tire shop put them at 50.
What are yall doing?

 

I’m at 34psi front and 32psi rear. On 285x75r17 Toyo Open Country’s.

I have 65k on my tires and plenty of tread left.

I get better fuel mileage at 36/36 but it rides rough and doesn’t wear even.

 

38psi same tire 285/70/17 D load maybe?

 

38-40

 

Mine are E-Rated

 

34 in front to compensate the weight in front, right? Mine bubble there at the bottom ever so slightly.

 

I'm on the same and about to drop them from 35psi. I'll try your numbers.

 

This is a great tool for getting air pressure right when moving to a different size or load rating tire.

 

I'm running the same size tire as you and I'm running 35 front and 34 rear. The only weight I have in the back is the topper. Seems to be the best balance of smooth ride and tread engagement.
I have E-rated tires, and thought about airing them up to 45 for a lot of highway, but haven't bothered.

The tire pressure calculator above mentioned by @frichco228 is a great resource.

 

Unless tire manufactures stopped putting their recommended air Pressure on their tires...go by what's marked on their tires for normal use.

 

44psi back 40 psi front tire recom at 45psi.... fwiw...

 

Start at 40 and do a chalk test, air up/down a little at a time and retest until the chalk wears off the tread evenly

 

The pressures listed on the side of the tire are max inflation pressures when cold. Not necessarily the recommended inflation pressures. More air in the tire adds more weight carrying capacity. If your not hauling, then less air can smooth the ride out a bit and give a better tread contact patch.

 

My E rated 285 75 16's paired with the stuff lift and all gets pretty squirrely over bumps/ dips on these AMAZING western OR freeways when im over 40psi on the front.

Ran 600ish miles at 38lbs and it is much better but believe may continue to drop before the next trek East this week and willl report back.

 

I’m liking how it rides both highway and in city at 35. While I was at 50, it seemed my truck had a wandering problem on the highway... Like it had a mind of it’s own haha. Alignment is near perfect. Maybe 45 might be a smidge too much.
Anybody get highway vibrations running this size of tire?

 

That literally makes no sense.

My 99’ Tacoma had E rated KO2’s on it. Truck rode so damn harsh it was ridiculous.

Check tire pressure, Costco set them to 80psi cause that is what was on the side wall.

They are now set to 26psi.

 

^^^Here's what KNABORS stated to my comment, and it shook my cob webbed memory right. Personally, I don't worry about tire psi as long as they're around 35. Have always put 35 in tires unless I was told that tires run at a specific psi. For example, had a Titan XD Cummins 5.0 with 20" rims that needed more than my accustomed 35 psi.

"The pressures listed on the side of the tire are max inflation pressures when cold. Not necessarily the recommended inflation pressures. More air in the tire adds more weight carrying capacity. If your not hauling, then less air can smooth the ride out a bit and give a better tread contact patch."

His statement is correct, and should make sense to you.

 

Sounds like you've found a good number.
I calculated mine based on the tire manufacturer's tire pressure charts. You should have a tire pressure chart where you can get the pounds/psi and calculate based on the weight of the truck. There's a sticker on the door frame with front and rear weight and you can factor in any extra weight you're carrying.

 

Exactly what I was describing happens to my rig at over 40psi or so. Dropping to 38 vastely improved handling for me and I imagine 36 will feel even better.

 

My truck was shipped from the factory with 265/70R16 (the same I run today). The door sticker specifies 26 PSI front, and 29 PSI rear. I run 32 PSI all around. The "chalk test" seems to support that.