When I bought my 6530 new in 2007, the front R1s had already started concentric separation rings at the start of the lug. I later went by my "have any kind of tire for anything" Titan dealer and he got in touch with Titan. They wanted pictures which he supplied and a matter of a day or two I had 2 new tires without cracks. I guess you would say that's honoring your warranty.
Fast forward, 2022, the new tires developed the same thing but over the years they have only slightly enlarged; nothing to even talk about. The rear Titan R1s have shown zero implications of cracking.
My take on their tires is that they have a tough rubber compound to resist wear and as a result don't include a lot of plasticizers that, when the tire is flexed in use, keep the rubber supple.....but that condition also leads to premature wearing. Damned if you do, damned if you don't..........