The San Mateo County Library in Portola Valley, CA provides loaner locks for patrons arriving by bicycle.
With a median household income of a quarter million dollars and a median home sales price over $2.8 million, I don’t perceive bike theft is a big problem in Portola Valley. Still, it’s a nice gesture, and I think it’s a good idea for any library.
Photo courtesy of Gregory Smith of Menlo Park and used with his very kind permission.
Update: Apparently, some libraries around the nation keep bike locks stashed away, but you have to ask about them.