after searching 20854, I also found 72239.
It's a 315/35ZR20 XL tire. It's apparently real. I see links to it on Amazon and other places and an actual picture of one on eBay. Odd that it's taken of Michelins website.
https://www.ebay.com/itm/315-35-20-1...ry!07652!US!-1