Boris Johnson among those taking part

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London mayor Boris Johnson will be among 20,000 cyclists taking part in the 100-mile ride. @itvlondon http://t.co/vtHREmO9he

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Johnson says he aims to complete the ride in 10 hours at the "speed of a French onion seller" @itvlondon http://t.co/KjErpDv1dD

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RideLondon will largely follow the Olympic road cycling course and is set to become an annual London 2012 anniversary event. @itvlondon

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Mass cycling event this weekend

RideLondon - the largest mass-participation cycling festival ever held in the UK - will take place across London and Surrey this weekend.