Even if you find a place near BART in SF you still have the issue that bikes won't be allowed on the train at commute hours time. Unless you have a folder... and yet, from what I saw on my way back home from the airport Thursday night, it won't necessarily be a piece of cake. It was late evening commute time at around 7:30pm, a guy had a folder, believe me if must not have felt welcomed. Many dark eyes toward him as people were trying to go around him when wanting to leave the train. The folder width was about the same as the aisle width. He ended up pushed all the way to the end of the train, guess what happened when he had to exit while the train was still packed.