Are you talking about "wear bars"? I call them worn out bars, 'cuz if they're even with the tread, the tire is worn out. But if you want to know exactly how much tread you have, Skunkworks is right.]
Yeah, thats them, but my tires don't seem to have any. I've ordered myself one of those tools Skunkworks recommended and I'm pretty sure I've got PLENTY tread left but it just seems like a bit of an inconvenience that Bridgestone didn't put a couple on my ties.