Of course, there is a bike store on the campus. A lot of people use bikes here, because it's the most convenient way to get somewhere. Cars are not allowed everywhere and walking around all the time can take quiet some time, because the Stanford Campus is really big. You can easily walk half an hour to get from one place to another.
As I said, I went to that bike shop and rented a bike. This one here:
So far, I'm really happy with it! To go the office it takes me about 15 minutes. I tried to find a route that is off from the big roads. Here's the route I currently take.