I mentioned it on a thread recently. The guy I saw appeared to be younger, although he passed me quickly and I only noticed him after he was about 20-30 feet ahead. (I was riding on CaBi and I wasn’t in a hurry to get anywhere.) Actually, he could have been anywhere from 25-35 yrs. old. Maybe even 40? I’m not sure. I think he only had one leg, the right one. It didn’t seem as though he had much of a left leg, but then again, that was from looking from 20-30 feet away. I only had a brief glimpse, since he was moving away quickly. I did see that he stopped for a breather after 50 yds. or so. Then he started pedaling again.
I’m pretty sure he only had one leg. He was only pedaling on the right, and I think he was tilted on the bike in an unusual manner. That’s what caught my eye that day.
When I posted about it, someone else said that they had probably seen that guy on the trails, and that he usually doesn’t call out his passes. He didn’t call out a pass when he went by me on the MVT that day. I’m not singling him out though. At least half of two-legged riders don’t call out their passes on the trails either.