Critical Mass is a mass bicycle ride that takes place on the last Friday of each month in San Francisco starting at 5:30 pm at Justin Herman Plaza (foot of Market Street) and in cities around the world. Everyone is invited. No one is in charge. Bring your bike. Please Note: Critical Mass tends to practice extreme bike power by taking to the streets and riding in the car lanes causing endless annoyance to motorists. In San Francisco especially, this event can get HUGE. There’s nothing officially organized, but just sort of “happens.” Get your costume on (just make sure it clears your gears and chain) and meet at 5:30 pm at Justin Herman Plaza! This event is free to attend.
Friday, February 23rd, 2018 at 5:30 pm at Justin Herman Plaza, 1 Market Street, San Francisco