World cycling chief Brian Cookson says he is concerned about delays to the Olympic test event in Rio de Janeiro after the company responsible for providing the wooden boards was changed by Games organisers. The event has already been pushed back two weeks, although Rio organising committee president Carlos Nuzman said in London this week that the event would go ahead on April 29-May 1. Speaking at the world track championships on Saturday, Cookson said he thought that date would be "a challenge". More...