Psi Oh Psi! Where do I set my- Psi!

TacticalSR5

TacticalSR5

New member
I'm running load range E (285/70/17) BFG All terrains and the guys at the tire shop told me my tire pressure was too high according to my 4runners door. They were at 55 and there dropped them to 45 I believe.

Question is, what Psi do I run? What the tire says? Or since the never see any real weight for E's, do I set then a little lower?

It's such an odd combo I just confuse myself over it. And the last thing I would think to be the right psi would be what my door says to set them at.
 
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I keep mine @40psi, but that's just me. Load range "E" tires have the ability to be filled to a higher capacity, but they don't need to be. Personally, I'd fill them to whatever makes the ride the best in your opinion.
 
It's such an odd combo I just confuse myself over it. And the last thing I would think to be the right psi would be what my door says to set them at.
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You can throw that sticker out the window. Those are the recommended psi's for the specified tire size listed.


If you don't want your E ply tires to scallop, you need to run them at 65 psi.
 
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Singtoe said:
You can throw that sticker out the window. Those are the recommended psi's for the specified tire size listed.


If you don't want your E ply tires to scallop, you need to run them at 65 psi.
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I disagree, my tires have never been over 40psi and have over 45k on them. They're wearing perfectly.
 
The listed PSI is usually max PSI and that's listed for a loaded truck and going over that max PSI isn't recommended but on a unloaded as you drive daily I stick undewr 40psi and see how they wear.
 
Singtoe said:
You can throw that sticker out the window. Those are the recommended psi's for the specified tire size listed.


If you don't want your E ply tires to scallop, you need to run them at 65 psi.
Click to expand...

I disagree as well. 285/75 E load BFG all terrains on my old truck, now my brothers truck. 35k (or more) and they've been run at 32-35psi the whole time. Wear is perfect and they are smooth as butter on the interstate.
 
More weight requires more PSI to wear correctly.

Example:
3rd Gen 4Runner = 4000lbs = 35-40psi (I run 35PSI with Toyo M/Ts)
Chevy 2500 = 8000-9000LBS = 65psi

More weight squishes them down more. More PSI is required to keep them standing at the correct height and contact patch.
 
I'd say around 40psi for your scenario. I really do believe that a C-load tire is better suited to a 3rd gen though.
 
It is what it is. You can listen to what some might say but experience has showed me the E Rated tires need high psi.

Here is the scenario:

Run the tires at low psi, run the chance of scalloping them
Mind you, that once the're scalloped, it is irreversible.

Run the tires at high psi, have a slighty bumpier ride, get better gas mileage and long life out of your tires.
 
I ran my first set of 265/75/16 Revos - D weight at 38 PSI in the front and 36 PSI in the rear for 8 years. For 81,500 miles before replacing them.

I have 285/75/16 Revos E weight on now and for the last 1.5 years have run them at 40 PSI in the front and 38 PSI in the rear.

If you are not carrying a load in the rear you don't need to inflate the rear tires as high as the front where you have the weight from the engine. Usually 2-3 PSI less than the front is fine.

I tried 35 PSI all around at first and my Runner handled sloppy. So, I went to 38 PSI for front and rear and found that 40/38 PSI handled and felt the best.
My tires a barely showing any wear after 1.5 years.


If your tires are cupping it can be from cheap tires.
If the tires are higher quality, and cupping still occurs, the problem is most likely a bad suspension on the vehicle. (Bad shocks, alignment or ball joints)..

If the suspension on a vehicle allows for the tires to bounce, as the vehicle rolls along, the extra action will make scuff marks on the tires, resulting in cupping.
 
ALBPM said:
I ran my first set of 265/75/16 Revos - D weight at 38 PSI in the front and 36 PSI in the rear for 8 years. For 81,500 miles before replacing them.

I have 285/75/16 Revos E weight on now and for the last 1.5 years have run them at 40 PSI in the front and 38 PSI in the rear.

If you are not carrying a load in the rear you don't need to inflate the rear tires as high as the front where you have the weight from the engine. Usually 2-3 PSI less than the front is fine.

I tried 35 PSI all around at first and my Runner handled sloppy. So, I went to 38 PSI for front and rear and found that 40/38 PSI handled and felt the best.
My tires a barely showing any wear after 1.5 years.


If your tires are cupping it can be from cheap tires.
If the tires are higher quality, and cupping still occurs, the problem is most likely a bad suspension on the vehicle. (Bad shocks, alignment or ball joints)..

If the suspension on a vehicle allows for the tires to bounce, as the vehicle rolls along, the extra action will make scuff marks on the tires, resulting in cupping.
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I can attest to that fact - ALBPMs tires look like they just rolled out of the tire shop.

I put 38/36 front/rear in my Duratracs and they ride great considering what they are. I will continue to play with psi in small increments but I think I am close.
 
NachoPitt said:
I can attest to that fact - ALBPMs tires look like they just rolled out of the tire shop.

I put 38/36 front/rear in my Duratracs and they ride great considering what they are. I will continue to play with psi in small increments but I think I am close.
Click to expand...

Where are the pics with the new Duratracs????
Your Runner must look baddazz with the 285s...

Pics or it didn't happen...:roadkill:
 
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