I remembered this post by Kingston a couple years ago, found it:
Originally Posted by
kingston
Puff the Magic 600k was nice. It's a great route with some hills, but nothing too major. Just enough to keep it interesting. One of our riders finished on a fat-bike, which I thougt was super impressive. ...
I remembered it because she finished a 200k on her fat bike faster than I did and she had shifter problems on that ride, often rode in too high a gear because of the shifter issues.