I purchased 4 Sailun S637 tires last year in August while in OR. On the way home I had a tread separation on one of the tires when I was in Las Vegas, NV. After I got home I found out that Sailun had issued a recall on my tires. The DOT dates that are affected are 2020-4120. So if anyone has this tire with the affected dates get with Sailun customer service to have them replaced free of charge at a local tire shop.