Rear Inner Tire Wear

Hello everyone!

I recently purchased my first truck, a 2020 Tacoma TRD Off-Road with 92k miles. After driving it for a while, I noticed vibrations and a bouncy rear end at high speeds and bumpy roads.

I took it in for an inspection, and the technician pointed out significant wear on the inside of all four tires, particularly on the rear. He mentioned that "weak shocks" could be causing the jumpiness and that type of wear. However, I’ve come across conflicting opinions on this in various forums and YouTube videos.

I’ve attached a couple of pictures showing the wear on the front and rear.

Front:


Rear:


It's important to mention that he believes a wheel rotation was performed, which would mean that the wear on the front tires resulted from their previous use on the rear.

So far, I’ve replaced the tires, lower control arms, struts, and shocks, and I’ve had an alignment done. Still, I want to ensure that the new tires won’t experience the same issues as the old ones.

Do any of you have recommendations for additional checks or adjustments I could make to prevent this from happening?

Thank you!

 

Willing to bet the alignment was off and tires were rotated. (that's why the rears were worn too)

I'm sure you'll be fine. Double check your alignment after 5k-10k miles if you're worried and definitely keep up with tire rotations on the new set.

edit: and check tire psi levels frequently

 

Hard to tell if that "wear" is actually wear, from something rubbing against the tire, or the outer tread (shoulder) being 'clean' from it simply not contacting the ground...

Are those the new tires? Outer treads not contacting the road is not highly unusual on brand new tires, even at the recommended pressure. You could try lowering the pressure slightly, but in the end it should even out (plus, lowering the pressure will impact the longevity of the tires, and your MPG).

I would still suggest do keep an eye on them though, if you see any sign of the rear tire tread "feathering", it's possible you may have a bent rear axle housing.

 

Weak shocks cause uneven up and down wear on the tread that you feel as you run your hand along the tread.



A simple test of the shocks is to push down on each corner of the vehicle then release . If the bounce stops quickly, the shocks are fine. If the vehicle keeps bouncing, the shocks are worn out.



I would be checking the front alignment for the tire wear on your truck. And balance of the tires for the bounce at high speed. You bought a used truck. Who knows what has been done to it.

 

Those were the tires that came with the truck when I bought it. The dealership told me that there were "new", but after the inspection I went back and they replaced them. So now I do have a confirmed fresh set of tires. I'll check the axle housing just to make sure that that's not the issue. Thanks for the tip!

 

That’s why I took it in for an inspection. I want to address the major issues now to prevent them from causing more problems down the line. Thank you for your response!

 

Take it to an independent shop for a 4 wheel alignment. I know there’s nothing to align in the rear end but the alignment machine should tell if the housing is bent.