Skip to Content
Streetsblog San Francisco home
Streetsblog San Francisco home
Log In

From Critical Mass:

Critical Mass is a mass bicycle ride that takes place on the last Friday of each month in cities around the world. Everyone is invited! No one is in charge! Bring your bike!

Next San Francisco Critical Mass: April 26th, 2013, 5:30pm, at Justin Herman Plaza (foot of Market Street).

Stay in touch

Sign up for our free newsletter