On Sunday 18 July 2010 many streets in Ealing will be closed to motor vehicles, making the borough the best in London for cycling that weekend.
The central hub of the eight-mile route will be in Lammas Park, where there'll be many stalls and entertainment.
Designated streets will be open to cyclists, and closed to motor traffic, from 10am until 4.30pm.
LCC local groups will be leading rides to the event from the following surrounding boroughs: Harrow, Brent, Hammersmith & Fulham, Richmond, Hounslow and Hillingdon) to the event.
You can see a map of the route here, or register to join a guided ride here, or find out about being a marshal here.
GOOD NEWS! Most dangerous lorries to be banned from London's streets
BIKE TEST (longtermer): Kinesis 4S Disc
Take action: Save Tavistock Place in one minute