President Carter was the first president for whom I cast a vote, while living in Leningrad USSR (where my father was working at the time) via absentee ballot. More recently I saw President Carter give a speech at American University in Cairo in 2008 while I was working there for some months. I strongly admire President Carter, both his time as president and his activities since leaving elected office.
Not the photo I was searching for!
I was looking for a photograph of President Carter riding a bicycle where the he and the bicycle are in motion, and in which he is not wearing a helmet. (The photograph occasionally appears with some remarks criticizing him for the lack of helmet.) Instead I found th rather different photograph (above) in which President Carter is also not wearing a helmet, but does have some headgear. And that isn't a Rivendell bicycle.
Flickr user Buster&Bubby has this information:
Jimmy and Rosalynn Carter biking in Yangshuo. According to a tourist web site: "In 1987, The USA president Jimmy Carter visited Yangshuo, his wife and he insisted that went around Yangshuo countryside by bicycle. Since that time, Rent a bicycle go around Yangshuo countryside has become the first choice to the tourists." Photo from lobby of our hotel.
Aha, I found the famous (or perhaps not so famous) photograph I was looking for. What do you know, he is riding his Rivendell.