In pictures: Royals get on their bikes

Princes William and Harry joined their cousin Zara Phillips at a charity polo match.

The young royals ditched their usual four-legged mounts to race around on bicycles at Tidworth, Wiltshire, to raise funds for Inspire, a charity dedicated to research into spinal cord injuries.

Playing on opposite teams, the brothers frequently clashed before the game ended in a 2-2 draw.

Prince William peddles furiously after his brother Harry

Prince Harry is close to his athletic cousin Zara

Prince Harry, 17, collects his prize of champagne

At times the players ended in a rugby-like scrum

Prince William, 20, scored a goal for his team

On safer ground: the brothers back on their horses