HANKOOK ION EVO AS TIRES Complaints

For several weeks the car has felt out of balance and I had it in the shop once to be balanced. The balance felt it lasted a very short time. I took the car in today to be checked out and the passenger rear tire couldn’t hold a balance. Mechanic removed tire and the interior sound deadening foam had detached on greater than 50% of the diameter of the tire. This has been widely commented on as a common failure mode for these Hankook tires on EV9 vehicles. I wanted the remaining tires inspected but as they would hold a balance the dealer had no reason to put in the labor of removing and inspecting the foam. 285/45 R21

These Hankook iON Evo tires started vibrating wildly at the first service that I took the car to for a rotation. We took it back to the dealership (Ourisman Kia in Fairfax VA) three times where they kept the car for several days to diagnose. After opening the tires up, they state that the inner sound insulating foam on all four tires has separated. The tires were at 7/32 and now 5/32 and the car only has 18,200 miles on it. The tires have a 50k treadwear warranty, but this isn't covered as part of the warranty. The inner foam separation on a Kia EV9 is a known issue and widely discussed on the internet. For an $80k vehicle with OEM tires that cost over $1500 to replace, it's ridiculous that they aren't covered by the dealership or by Hankook.

 A little background information, on Dec 2023 I installed 4 new Hankook Ion Evo AS (255/45R19) for my Tesla model Y at the Correa Tire shop in Dorado Puerto Rico and the manufacture date on those tires was 4422 and at the time the car had close to 30k miles.  On April 2025 one of the tires broke and I replaced it at the same place with the same tire model.  Less than a month after the new tire was installed, while riding on the highway at close to 65mph the recently replaced tire completely broke off leaving only the sides and the rest of the tire flew off the car (see pictures attached).  This happened suddenly with no previous indication or car notification of any issue with the tire.  Fortunately, I was able to stop the car without losing control and apparently the tire did not hit other oncoming cars.  This was a very scary situation, which could have resulted on a serous and even fatal accident.  When I checked the new tire, or what remained of it, I noticed it had the same manufacturing date (4422) as the tires I had replaced in 2023. The next day I went to the tire shop and explained the incident and they informed I had to buy a new tire while they investigated the situation and if there was any issue with the tire. At that time I also opened a complaint with Hankook US. After waiting various weeks for a response, and expecting reimbursement for the damage tire, I have not received any information from the tire shop and Hankook said they did not receive a claim from the tire shop.