The new sportive will take place on the same day as the established RideLondon 100 event, with around 3,500 riders expected to set off along closed roads after the final wave of the 100-mile riders on July 31.
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The RideLondon 46 route will take riders from the Queen Elizabeth Olympic Park in Stratford through the centre of London and out into Surrey via Chiswick and Kingston-upon-Thames.
From there they will return towards the capital via Wimbledon and Putney before finishing on the Mall.
Wiggins said: “This is a fantastic event for new and young riders. 46 miles is still a challenge but it’s also a great introduction to cycling on traffic-free roads and it’s a wonderful way to ride your first sportive. And nothing beats riding up The Mall and crossing the line in front of Buckingham Palace. Get online and enter today!”
A public ballot for the new event is open on the RideLondon website and will close when 3,500 riders have registered or on April 28, whichever is earlier. Entry will cost £39.