Olympic gold medallist Joanna Rowsell will take part in a 100-mile bike ride from London to Surrey - the furthest the track cyclist has ever ridden.
Rowsell, a world record holder who secured a London 2012 gold in the team pursuit, is cycling in the first Prudential RideLondon-Surrey 100 in aid of Action Medical Research, the children's charity of which she is an ambassador.
The 24-year-old said: "I think the event is a fantastic way to celebrate one year on from winning gold at the Olympic Games and with a large section of the route being held on my home training roads I hope I will be able to assist the other Action riders with some local knowledge.
"I have never actually cycled 100 miles so it will be a great challenge for me too. I have been working with Action Medical Research for two years now and am honoured to be part of Team Action for what is sure to be a memorable event."