Today more than 50,000 competitors will take part in a 100-mile road race on a route that starts in the Queen Elizabeth Olympic Park in east London, scene of last year's Games, before taking them into the Surrey countryside.
Rugby World Cup winner Matt Dawson, two-time Olympic rowing champion James Cracknell, former Olympic champion sprint hurdler Sally Gunnell and actor Gary Kemp are among the famous faces taking part.
For the first time since London 2012, cyclists have taken over the capital. This weekend more than 70 thousand people are taking part in RideLondon -- billed as the country's largest ever festival of cycling. The aim -- to get more people in the capital on two wheels. Rags Martel reports.
Transport for London has warned that many roads will be closed this weekend for the RideLondon event. On Saturday, Central London will be affected when the FreeCycle ride takes place between the Tower of London and St James's Park.
Several crossings across the river will be closed on Sunday:
Blackwall Tunnel / A12 southbound - closed from 0100 to 0900 (A12 northbound from A13 closed from 0500 to approximately 0900 and A13 eastbound and westbound from A12 to Leamouth Road is closed from 0500 to 0900)
Tower Bridge and Southwark Bridge - closed from 0400 to 1515
Westminster Bridge, Lambeth Bridge & Vauxhall Bridge closed from 0500 to 1930
Chelsea Bridge, Albert Bridge & Putney Bridge - closed from 0500 to after 1915
Chiswick Bridge - closed from 0500 to 1430
Kingston Bridge - closed from 0500 to 1915
Hampton Court Bridge - closed from 0500. Open from 1530 northbound and 1900 southbound
You can enter and exit at any point along the route, do as many laps as you like and come and go as you please.
There’s also a shorter two-mile loop that takes in The Mall, Whitehall, Embankment, Parliament Square and Birdcage Walk, if you don’t want to venture too far from Green Park.
Cyclists will also be able to stop off en route to enjoy a range of bike-based entertainment and activities.
There will also be a variety of bike-based entertainment for the whole family to enjoy along the route.
There will be three separate Festival Zones at Green Park, St. Paul’s Cathedral and Tower Hill. Each Festival Zone will feature live bike-related entertainment including games of bike polo. music, shows, demonstrations and workshops as well as enticing food and drink options and kids activities.
If your bike needs a quick once over or a little TLC, pop along to see one of the CTC bike doctors, who will be located in all three Festival Zones. The CTC bike doctors will also be roaming around the PrudentialRideLondon FreeCycle Route in case you have a breakdown while you’re on the move.
There will also be music zones along the route featuring a variety of musical entertainment and noise zones along the route where riders will be encouraged to make some noise by ringing their bike bells and peeping horns.