Just dont get it - Tire pressure

I have 2 sets. Both 255/85/16 load E. My current "summer" tires are Toyo M55s and my winter tires are Dean Backcountry MTs siped and studded.

 

Montana, i see. well that makes sense.

 

Don't know if this will help but here is picture of the tire pressure update door sticker if your truck came with LT tires. The TRD PRO guys should be able to verify this.

 

But not all LT are E rated, right?

 

Correct.

I run C-rated LTs

 

I have 33x12.50x15 KO2s E rated and I messed with my tire pressure the other day. I noticed my rear passenger tire was really worn down in the middle and the rear driver tire was fine, so I lowered the passenger side to match the driver side which was 28 psi.... coming from 31-32 which cause the weird wearing.

 

Cold readings, right?

 

Yea it was about 40 or 45

 

Cupping can occur from over inflation, broken ribs, improper balance. The picture simply shows where the stress is at when the tires are over/under inflated.

 

My tires are e rated as well. I run them at 32 rear 33 front. Thats with arb bar and winch. Over 40k on tires, they have another 10 to go. Wearing good an even. I rotate every oil change.

 

Well I think I got my front ok now at 30 (cold), 33 (hot). My rear seems to still not sit flush all the way across at 28 (cold), 31 (hot). Going lower than 28 seems not right. Idk

 

I'm running 30 cold (32-33 warm) front and 28 cold (30-31 warm) rear, and my truck is heavier than yours. 255/85-16 E tires on stock 7" wide wheels.