Full Info: www.redbull.co.uk/personalbest Red Bull has teamed up with the world's most successful downhill mountain bike siblings, Rachel and Gee Atherton, to help you beat your own personal best on Downhill Mountain Bike trails across the UK. Go to www.redbull.co.uk/personalbest and use your smartphone to compare yourself against their times and other riders on the tracks, and see if you can improve on your own personal best. #rbpersonalbest

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