Tire tread wear - Tire Cupping

I have Toyo OC AT3s on my Tundra and my son recently pointed out tire chopping on my outer tread blocks, mainly the ones that were on the front. Its not crazy but does make me wonder why it is happening. Can definitely feel it by running my hand over it, raised/ higher tread on the frontside of each tread block. I did install RC coilovers to level my ride at 3k, currently at 20k. Had the truck aligned twice when tires were installed, one shop didnt do it right. I rotate every 5k, last one I didnt get to it until 7k. I was rotating front to back per side. Last night I rotated in an X which puts the high side of each tread block to the back of the block.

Has anyone else experienced this? Hate to see tire wear given the high price of rubber.

 

Reduce your tire pressure and see what happens.

 

I was at 45psi, should I run 35psi per the door sticker?

 

Anytime an unknown shows up on a vehicle I tend to hit the panic button, lol.

 

Interesting. I've never seen cupping at higher psi. I've also never seen rotating in an X pattern on radials, I've always heard keep the tires rotating the same direction (on the same side). I generally run higher psi in front unless towing something, but definitely higher psi for summer/economy. I have experienced cupping but only at lower psi.

 

following

 

I also have Toyo AT3s and the RC N3 front struts and I also noticed uneven wear. I had another alignment done and it seems better... but I'm just like you - paranoid it's not absolutely perfect!

Can you share a pic of the cupping?

[Edit - I run all 4 tires @ 42PSI]

 

This is the best I can get, more about feel really for me. Right side block is higher on the one side than the block on the left.

 

Lot of times cupping can come from not rotating. Also can come accelerating hard too or over torquing.

 

As far as rotation goes, my understanding is drive wheels move straight (forward or back on same side) the other two cross over to the other side. I've always done it this way, it helps to keep wear patterns at a minimum.

Of course proper alignment is always important.

 

There are quite a few tire rotation methods that are acceptable to use based on the drive type (rear, front, 4-wheel). In my case, I choose what would make the most sense given my situation. I also took the advice and dropped my tire pressure. All seem well currently, I’ll monitor wear as I put on more mileage.

 

that's what I was told and I didn't do

 

Does it vibrate or wander to a direction when driving? You can get cupping with funky toe on occasion, too...I'd do the "cheapest" first and air down to 36psi and see how that works...then address the next solution...

 

It tracks straight.