I noticed mine are cracking in the area between the tread. I have 43,000 on the tires so I'll get about 10,000 more miles. I am not that concerned about weather chex that appear between the tread. So far, I think the tires on mine are holding up ok. I think the tires are supposed to run at least 65,000 miles. My next tires will be Goodyear Fortera SilentArmor. See link below.
I have had excellent service from Goodyear Wranglers, Eagles, and other models through the years.
Goodyear Tires | Find The Right Tire | Display | Fortera SilentArmor