BMX world champion to test London track

World champion Mariana Pajon will compete on the Olympic BMX track for the first time at the 2012 test event 19-20 August.

The 19-year-old who hails from Medellin, Colombia's second-largest city, has already won 14 global titles.

Great Britain's three-time world champion Shanaze Reade is one of her idols.

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You can watch a special Olympic Countdown programme on BBC Two on Sunday at 1300 BST.

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