I forgot about the speedbump vid...ouch.
Many of the streets of SF are very steep and and narrow, and have street car tracks, and all are crowded. The speed of the R3 is useless in that environment and the weight and lack of agility are a liability, same goes for touring beamers and harleys. It might come in handy to be able to hop a curb too. Then there is Lombard Street: