I would guess around 24 maybe. They split into three groups, not sure of the exact distance of the other rides, but ours was 13 miles, then there was one around 20 and one around 40. We only had 6-8 people in our group. I'll have to count heads when the photo comes out on the trek website, but there were a few people arriving as the photo was taken, too. It didn't seem like a lot of people, to me, but this was only the second year for it.
vickie