Today, I rode my SS Volpe on the Phoenix MUP paths and canels to meet a business colleague and friend for breakfast, about a 25 mile round trip. On the way home, it was way hot and I was dogging it on the North Indian Bend Wash path, say 16-17 mph. All of a sudden, this guy on a tricked out MTB with 1" slicks blows by me. I kick up to see what this was all about. Then I notice, he has one leg and has his prothesis strapped on his rear rack. With one leg, he is blowing by me at 20mph. He was bone thin which makes sense and cranking the one leg at 100+ rpm, . I follow him for about four miles, amazed at what he is doing. We exchange greetings and parted. This guy must have had balls the size of melons. I wanted to talk to him. How do you start? How do you stop? Amazing.