Schwalbe tires have a 3 year warranty. I recently had a defective new Schwalbe Marathon (not Supreme) tire. I bought it last year but didn't mount it until about 10 days ago. There was a bump with every revolution of the wheel. I took the tire off and examine the inside of the tire, the tube, and the rim. I saw nothing unusual. I remounted the tire and there was still a bump, and the tire appeared to have a bit of a bulge to one side with each revolution. I removed it and put on the other new Marathon tire I bought last year and there were no problems with that one.

The Schwalbe website has a warranty form you can fill out online. They want some photos for 3 designated things: Product name, Production Code, and photo of defect. The Production Code is a white mark on the inside of the tire. Each photo cannot be more than 2 MB. I filled out the form and submitted it. About a week later I got an email saying it would be covered under warranty. I have to get the replacement from their online store and the email contained a warranty code to use. My tire is out of stock right now but they're supposed to send me an email when it's available again.

https://www.schwalbetires.com/warranty/