So I switched my summer wheels and tires with Hankook V12 summer tires to my winter wheels and tires in Nov 2017.
Yesterday I switched back to my Hankook summer tires. I confirmed the direction, torque and air pressure.
I drove the car and it felt quite squirrely. Almost floaty. Especially over rough roads I felt I was constantly making steering corrections to keep it straight. I took the car for wheel alignment and everything seemed within spec.
Could this be due to my summer tires? they were perfectly fine when I removed them last November.
I don't know tires. How bout the thought that maybe some brands of tires (that now have to be classified as in the used category) need a few heat an cool down cycles put on them, to bring them back to remembered normal stickiness (after sitting on the shelf for a long period). Then again, maybe this thought is meaningless.