George Bush said it was time he grew up after cycling into a police officer - on his 59th birthday.
The American President's mishap came on his mountain bike outside the G8 venue.
Bush, who was left with cuts to an arm and hand, showed off grazed fingers to reporters and grinned: "It goes to show I should act my age."
The president blamed a rigorous work-out and the damp conditions as he appeared at an early press call with Tony Blair.
He said: "When you ride a mountain bike, sometimes you fall, otherwise you are not riding hard. The pavement was slick and the bike came off underneath me."
His concern, he said, was for the Strathclyde officer adding: "I talked to him. He is doing fine."
In May last year President Bush crashed his bike on his ranch. In 2002, he famously fainted and toppled off his sofa in the White House when he choked on a pretzel and in June 2003, he fell off a scooter at his estate in Maine. - Ananova.com