Is this cracking bad enough to cause a blowout? Steer tires.

I found nothing in the regs regarding cracking, so..

As long as you have good legal tread I’d roll with drive tires that way. Steer tires I take a different stand, it’s my life and that overrides anything else.

If cracking is really bad and the tires are old (6years) I would not drive on them.

 

Looks like a drive tread. If above 2/32" drive it home.

 

Where's the tread? I have my doubts those tires have enough tread left to be considered legal. Even if they're still legal its just an open invitation for the DOT to look and see what else is wrong.

 

Good point and I should have said that in my post. Does that tread depth look legal to you?

 

By the hair of a frogs ###. 2/32s isn't a whole lot of tread.

 

It's very close. I would say legal, but not for long. OP needs a tread depth gauge.

 

Or a penny.

 

anything below 2/32 in a major groove is illegal, or 4/32 for steers.

 

They need to be replaced by the looks of it. I wouldn't even want those as drive or trailer tires.