I rotated my tires yesterday and noticed what looked to be dry rot cracks in the sidewalls. The crack is about 1/2" outside of the rim, the entire circumference of the tire and on all 4 tires . They're not overly deep but the location has me concerned. The tires aren't quite a year old and have about 10,000 miles on them. The tires are Cooper Discoverer ATRs. Is this something I should be concerned about and bring them back to the tire shop or just drive and forget about it?
Before anyone asks, I don't have picks, it looks like a normal dryrot crack, not too deep but you could get your fingernail into it.