People are being encouraged to get on their bike to help break a world record.
Cyclists will be leaving Ickenham and heading towards Buckingham Palace for the Prudential RideLondon FreeCycle on Saturday (tomorrow).
This weekend's festival of cycling in the capital is billed as a true legacy of the 2012 Games, but has been going since 2007 when it was known as Hovis Freewheel, and later as Skyride.
More than 50,000 riders are expected to take to the streets at this mass-participation celebration of cycling, with the chance to experience the fun and freedom of cycling through London on an eight-mile traffic-free route that features many of the capitals world-famous landmarks, from Buckingham Palace in the west to the Tower of London in the east via the Houses of Parliament and St Pauls.
Saturday morning will see an attempt at the Guinness World Record for the longest single line of bikes.
If you want to ride your bike all the way in, organised groups will be starting from the Ickenham Pump, 16 High Road, Ickenham at 9am.
People wishing to register to take part should visit the RideLondon web site http://www.prudentialridelondon.co.uk/