Found some depressions in the sides of my tires, normal or bad news?

I've been having steering issues for quite a while, and it seems to be from a multitude of issues. At the last alignment place, the guy pointed out how when you look at my tires head on and spin them, you can see the tread wavering back and forth. He said that could cause a slight vibration, but he wasn't clear on if that was common or these tires are getting bad.

They are wearing well so far. There are about 19,000 miles on the tires. Mostly all pavement, some dirt roads. I don't do any offroading.

I just noticed this because the sun was hitting them just right a bit ago. What do you guys think?

As you can see, the spot I saw on the front is a lot worse than the one I saw on the back. I didn't inspect them for more of these yet, just saw this a few minutes ago. These two were just clear as day because of the angle the sun was hitting them.

 

I've had that on my tires also and someone explained to me what it was (I wish I was paying better attention) but it's nothing to be concerned about. Just keep an eye on it to make sure it's not something serious like your tires coming apart but it doesn't look like it at all.

 

I see the model is grabber, i dont know about it, but i had it on my Chevy silverado form oem, and the same depresions on siedewall. I dont know if is something regarding the tire brand (GENERAL). By the way, its an excellent brand, i gave mine about 60.000km

 

I've had that happen on a few sets of tires and different vehicles, none of them were General. Just a tire thing, not specific to General.

 

looks normal.

 

Alright, thanks guys.

What about the tread wavering I described in the OP? Does that sound normal too?

 

Never paid much attention... not sure about that one. I'd have to look and see if mine do that also. I'd imagine some wavering is normal just with production but probably not like what you're talking about. If it's causing vibes and you can visually see the tire is off, sounds like it may have been a bad tire to begin with. Do all of your tires have wavering in the tread?

 

Don't know about the rear, but both front tires were doing it, so I'm guessing all four probably do.

 

I'm not sure about that one. I'll let someone who knows answer this one. The first part was easy, now you're getting all technical! Hopefully someone chimes in that can help out. Sorry man, but I if I don't know the answer, I'm not one to pretend I do. Good luck!