Question about defect in Goodyear G286 tires

[cattlerepairman]

I showed my Deuce on a truck show this weekend and one visitor pointed out what he is convinced is cracking tires.
What to look for: In the centre groove of the the tread is what appears to be another thin groove (or "crack"). To me, it looks to be symmetrical and machine cut.

However, the visitor was adamant that this is in fact the tire cracking and that this is how radials break. I remain unconvinced. The tires are soft and have no other visible cracking. The "crack" is uniform in appearance and no cords are showing.

I'd like to hear from other G286 owners or tire experts.
Insights?

Here is a picture of a tire that displays what I am talking about (not my tires but looks very similar). The thing to look for is the thin black line following the zig-zag pattern of the centre groove.

 

[plym49]

How coincidental this is! I noticed the exact same thing on my G286 tires yesterday. At first I, too though it was a crack but it is just too symmetrical and the edges too smooth to be a failure. I don't know why the groove is there - perhaps it adds compliance under side impacts to make a blowout less likely - but I am sure someone will know for sure.

BTW, the tires on my truck seem new and I doubt they have 2,000 miles on them. Hard to believe they are about to fail.

 

[Castle Bravo]

I think that all 30 or so of the G286s I've owned have had that groove.

 

[cattlerepairman]

Thank you, gentlemen. That concurs with what I was thinking. At ease.

 

[silverstate55]

All 6 of mine have it; it looks like the centerline of the tire mold to me.