Lance Armstrong brought an end to his international cycling career yesterday when he completed the final stage of the Tour Down Under in Adelaide.

Cancer survivor Armstrong won a record seven Tour de France yellow jerseys, but failed to produce fireworks on what was his final professional race outside the United States.

Armstrong won no stages in the six-stage event, finishing 67th overall at 6min 42sec behind 23-year-old race champion Cameron Meyer of Australia.

The 39-year-old American is still contracted to the RadioShack team, for whom he is scheduled to race in a number of multi-sport events.

Armstrong’s participation in mountain bike races or triathlons could be determined, however, by the outcome of a federal probe launched following allegations that he doped regularly while racing with US Postal in 1999-2004.

Armstrong said last October that the Tour Down Under, where he launched his second comeback to the sport in 2009 – having retired after his seventh Tour de France win in 2005 – would be his final international race.

Having been forced onto the defensive earlier last week in the wake of further allegations of doping in a website report by Sports Illustrated magazine, Armstrong avoided all media after the race’s end and instead made a brief appearance on the podium.

The Texan paid tribute to everyone involved with Australia’s premier cycling event, which his presence has helped to boost in his three participations.

“Thanks for a great couple of years, a great few years. Not just from myself but from all of us in the peloton,” he said.

Armstrong was due to fly to Brisbane yesterday where he has organised a ‘Twitter’ ride alongside Australian sprint specialist Robbie McEwen, who recently signed for RadioShack.

The 25km event is designed to help raise funds for the Queensland floods fund, and is expected to attract thousands of members of the public today.

“We’ve had an outstanding response so far and thanks Robbie for getting me on board to help out Queensland in its time of need,” Armstrong said in a statement.

McEwen said he felt he had to help out his fellow Queenslanders, especially with some of his own family hit hard.

“I needed to do my bit to help out. It was lucky we were in Adelaide at the Tour Down Under and the opportunity arose to come up to Brisbane to assist,” he said.