More than 70,000 cyclists, including some of the world's top professionals are expected to take part across four separate events this Saturday 3 and Sunday 4 August.
The four events making up the two-day cycling festival are:
The Prudential RideLondon Freecycle... Saturday 3 August
This eight-mile mass-participation ride is free to enter and open to cyclists of all ages and abilities. It aims to encourage anyone inspired by the London 2012 Games to take up cycling as part of an active and healthy lifestyle.
The Prudential RideLondon Grand Prix... Saturday 3 August
Featuring the world's best women, junior and hand cyclists in action on a circuit in and around St James's Park.
The Prudential RideLondon-Surrey 100... Sunday 4 August
Open to amateur and club riders, 20,000 cyclists will take part in the 100-mile challenge event.
The Prudential RideLondon-Surrey Classic... Sunday 4 August
For elite men's professional riders brings the drama of a classic one-day style of racing back to Britain.
The 140 mile route includes all the highlights of the Prudential RideLondon-Surrey 100 route plus the testing challenge of three ascents of Leith Hill, the highest point in Surrey and even steeper than Box Hill.
More top news
Arriva Rail North, Greater Anglia and South Western Railway are all affected.
The Duchess of Cambridge was beaming on the steps of the Lindo Wing hours after giving birth. Mums are also revealing how they looked.
Everyone has their heads down and their eyes averted but I know they can sense my presence.