VENUE FACTFILE Events: Cycling Athletes: 188 Spectators: 5,000 Schedule: 20-25 August Paralympic event: Cycling (18-22 Sept) Enlarge Image

It has been among the more controversial of the Olympic projects due to the ambitious nature of the structure's glass and steel roof.

Spanish architect Santiago Calatrava is responsible for the design, as well as that of the much-delayed main stadium.

And there was huge relief when the velodrome roof was finally put in place at the end of March.

It will seat 5,000 spectators and host the Olympic and Paralympic track cycling events.