Rear tire ware

So I got this truck a couple years ago, the tire in the back had heavy ware on the inside edges… I assumed maybe they had been on the front and never rotated. Bought new ones and now after a year the same heavy ware is showing… trying to ID what it could be, I’m thinking bent axel housing…but nothing obvious.

any idea as to what this could be? I don’t know much so looking for all the help I can get! thanks

 

Hi... Have you had a 4 wheel alignment? might be the way to go. - just a newbie guess though.

 

You are over inflated.
https://duckduckgo.com/?q=over+infl...4446/EDUtire-pressure_over-underinflation.png

Double check your PSI on all four tires, and if you are running a stock size tires & weight compare them to the PSI rating on the door Jamb on the driver side.
If you have tires that are outside of stock size, or are carrying load constantly, you would want to do a chaulk test.

https://www.youtube.com/results?search_query=tacoma+chaulk+test

As far as I'm aware, you cannot align the rear axle easily compared to the front. But never hurts to see what the math's says on the rear axle.

 

Not possible, if someone tries to sell you one (for a Tacoma) call em out on it

 

would that be the case if only the rears are doing this? I have been pretty conscious of PSi but I haven’t done a chalk test… so I could be way off.. but the fronts are wearing great

 

Totally possible, that's how I found out my rear axle was bent!!!!

 

Let’s say for example, you are at 30PSI when at home.
Then you put 1,500lbs of load on the bed of the truck.
(Other than the truck handling differently and other stuff.)
Your tires then shoots up to 45PSI thus causing it to be over inflated.

Granted this example is over exaggerated.

It’s hard to tell without any further information. IE tire size, age, current weight, current PSI, or alignment maths.

More data is needed.

 

Need more info:
lift kit? what kind?
what does the other side look like?

 

Please explain how putting 1500lbs in the bed raises tyre psi???

 

I was going to ask the same.

 

Think about it.
Added load onto a vehicle will increase pressure.

If you inflate a balloon at xyz psi and therefore put your foot on it. The pressure of that balloon will change, and so deform itself.
In the example just stated, would that balloon not change its pressure?
If you put your full body weight onto said balloon, would it not reach its maximum pressure before exploding when it cannot sustain any more pressure?

I have seen it change when loading my truck or other commercial trucks. Granted not as exaggerated as what I have explained previously, but it will change.

 

And what did they align to resolve the issue?

You had a problem, not an alignment issue.

 

Rear axle was bent, not enough to see with the nekid eye but showed up on the 4wh alignment

 

how so

1. alignment machines are not always accurate. The read heads are sensitive to the tiniest imperfection such as not being mounted dead center.
You could damn near breath on the read head and it will change the number.

At the end of the day
-the rear is not alignable from factory, so the idea is forget about it
-shims exist, so if it consistently shows toe out or something to a large amount, then why not try something like shims. What other choice is there.
-if you really do suspect it is bent, there are probably ways to measure and check for that

IF it's slightly bent, is that really a big deal?
maybe mine is. Maybe it's not. I don't detect any other issues.
Not a cheap or easy job to replace. Let alone upgrade to stronger.
and if you get used, then maybe there's a chance that is also bent.

Hell I wonder if it can be bent back, whether at a collision shop on frame rig, or crash into some shit on purpose give it a little love tap in the opposite direction.
Maybe there's other ways to check, or telltale signs such as bearing/seal issues.
Probably all of us are due for new bearings/seals in the rear. At which point that's also an opportunity to peek into the housing with a flashlight and see if it looks straight or not.

Also, here's a question
IDK anything about shims. Or if toe is even what they're for.
I did notice, my toe may be different since I switched bump stops.
How do you know it's not possible to do SOME toe adjustment simply by while on the alignment rack, loosen the u-bolts and try moving the axle a bit, if it does at all

I think shims are just to tilt the axle angle for less axle wrap and propshaft strain
that doesn't change locating pin or toe
which doesn't really seem to be a thing given people doing mods are typically getting a better leafpack that doesn't have those problems.

 

Adding weight to your truck doesn't increase tire pressure. Heat does. That's why you should check pressure when tires are cold. 35 PSI cold will go up to 38-40 PSI while being driven on a hot day. And that is perfectly normal. If you get a 40 PSI reading from tires that have been driven for a while don't panic and the lower pressure.

Running tires underinflated will also cause them to run hot and possibly fail.

As to your problem, I have no idea. Never seen that happen to rear tires. Happens a lot to the fronts if not aligned properly.

 

You can buy a digital level, butt it up against the rim lip, and check rear camber yourself. Be sure to do this when parked on level ground.

The tire is pretty worn even on the outside. This is a new tire after just a year of driving? How many miles did you do in a year?

 

Check suspension components.

 

That tuck has seen a few feet in the air once or twice in its life before you got it. Check that the rear axle is straight.

If tires were over inflated, wear would be in the center and tapered outwards evenly. Not shifted to one side (inward) like seen in the pic.

 

Also, Im gonna be that guy. Ware is something thats sold or possibly a type of wolf. Wear is use or damage.

 

That was my thoughts as well, but from everything I can see and measure (without any fancy tools) it looks ok… what would be the best way to check this