At the entrance to the Hyatt on Market Street bicycles line the street awaiting tourists. Passing by, I was struck by the perspective of the bikes with the Ferry Building clock tower in the distance at the Embarcadero.
I can't tell you anything about the bike rental other than it was a great photo op. But, if you are planning to visit San Francisco, renting a bicycle might be a nice way to get around. If you travel along the water front, you can avoid the hills.
Photo taken with a 40D, exposure 1/100 s at f/5.6, ISO 200, focal length 17mm.