Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

xerocracy in action, old school vibes. How it used to be done! before the internet, there was IRLO - in real life only #criticalmasslondon #criticalmass #londoncriticalmass #londoncycling #flyers #posters #leaflets #zines #xerocracy #archive #ephemera #maydayrooms

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

This Thursday 4th December, 7pm at Mayday Rooms, 88 Fleet Street Come listen to Des Kay and other CM OGs from previous decades reflect on 20 years since the Law Lords judgment protecting Critical Mass London's freedom of assembly Event starts at 7:30. Duration 60-90 mins. BYO. Entry is free, donations for Mayday Rooms welcomed. Drinks nearby afterwards.

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

Check Pinned Post For More Information and frequently asked questions. Every last Friday of the month, hundreds of cyclists gather on the South Bank under Waterloo Bridge (by the BFI/National Theatre) to meet at 19:00, with average departure around 19:30. No leaders, no fixed route, just a massive, joyful celebration of bikes claiming the streets. #CriticalMass #CriticalMassLondon #LondonCycling #CyclingEvent #BicycleRide #london

28th November 2025 The Last Friday of every month, 19:00, Southbank under Waterloo Bridge. Avg. departure 19:30. Check Pinned Post For More Information and frequently asked questions. Critical Mass is a monthly bike ride on the last Friday in over 300 cities, started in 1992 and in London in 1994, to highlight bike-unfriendly cities. With no formal leadership, cyclists meet at a set time and place to ride together.