It's not a saw blade, it is what's left of a rear sprocket on a strutted Sportster after a hard run across the country.
I first noticed extreme chain and sprocket wear during Stampede 9, when my Sportster was strutted.
I wrote about that unusual wear in my "belt vs Chain" post (click on the label below).
I wrote about that unusual wear in my "belt vs Chain" post (click on the label below).
I think that there is something about a strutted Sportster that causes heavy chain and sprocket wear. Perhaps it is the lack of any "cush drive", like we see in many other chain driven motorcycles.
Gordon Porritt (#4) finished 33rd despite the extreme chain and sprocket wear.