Sir Chris Hoy's career in pictures

Chris Hoy (left), Craig MacLean and Jason Queally
Born in Edinburgh in 1976, Christopher Andrew Hoy was inspired to cycle at age six by the BMX scene in 1982 film ET. Alongside Craig MacLean (centre) and Jason Queally (right), he won silver in the team sprint at the 2000 Sydney Olympics
Hoy at the Commonwealth Games in Manchester
In 2002, Hoy clinched his first gold medal, winning the 1km track time trial final at the Commonwealth Games in Manchester
Chris Hoy celebrates winning the men's team sprint at the 2002 Track Cycling World Championships in Copenhagen
The same year, Hoy clinched gold with team-mates Jamie Staff and Craig MacLean in the men's team sprint at the World Championships in Copenhagen, one of two golds at the championships for the Scot
Chris Hoy (centre) wins gold in Melbourne
It was gold again at the 2004 World Championships in Melbourne, Hoy defeating Arnaud Tournant of France (left) and Tuen Mulder of the Netherlands in the men's 1km track time trial final
Chris Hoy wins gold at Athens Olympics
The same year, Hoy was flying the flag for Great Britain again at the Athens Olympics, collecting his first Olympic gold medal in the 1km track time trial
Chris Hoy (centre) celebrates his sprint gold medal with France's Mickael Bourgain (right) and Kevin Sireau
In March 2008, Hoy (centre) became the first British cyclist in 54 years to win the world sprint title at the World Championships in Manchester. He also won gold in keirin and silver in the team sprint
Chris Hoy poses with the gold medals won during the 2008 Beijing Olympic
More success followed at the 2008 Beijing Olympics, as Hoy became the first British Olympian for 100 years to claim three golds at one Games, by winning the keirin, the team sprint and the individual sprint
Lewis Hamilton (left), Chris Hoy (centre) and Rebecca Adlington
British cycling ended the year on a high as the Beijing Olympic team was named Team of the Year and Hoy (centre) voted Sports Personality of the Year at the annual BBC Sports awards show
Chris Hoy with the knighthood medal he received at Buckingham Palace
And to complete a remarkable year, Hoy was a awarded a knighthood in the Queen's New Year Honours List
Chris Hoy suffers injury during the 2009 Copenhagen World Cup
There was less happy news at the beginning of the following year, as Hoy was seriously injured in crashing out of the men's keirin final at the 2009 Copenhagen World Cup, forcing him to miss the World Championships in Poland
Chris Hoy won his 10th world title at the 2010 World Championships in Denmark.
However, it wasn't long before he was back to winning ways and he landed his 10th world title in the men's keirin at the 2010 World Championships in Denmark. He also won bronze in the the team sprint
Chris Hoy takes third place in the team sprint at the 2010 European Championships in Poland
After announcing his decision not to go to the 2010 Delhi Commonwealth Games in October, Hoy won bronze in the team sprint at the European Championships in Poland
Chris Hoy (left) celebrates winning silver on the podium with Shane Perkins (centre) and Tuen Mulder after the keirin final during the World Championships in Apeldoorn, Netherlands
At the 2011 World Championships in Apeldoorn, Netherlands, Hoy (left) had to settle for silver in the keirin. He also won silver in the sprint and team sprint events
Sir Chris Hoy (left) celebrates with second placed Maximilian Levy (right) after winning the sprint final at the test event for London 2012 at the Olympic Velodrome
In February 2012, Hoy (left) took part in the test event for London 2012 at the Olympic Velodrome and won the sprint and keirin finals
Chris Hoy (left) on the podium after winning the keirin final at the 2012 World Championships in Melbourne
At the 2012 World Championships in Melbourne, Hoy (left) won the keirin final and claimed bronze in the sprint
Chris Hoy with his gold medals at the London 2012 Games
At the London 2012 Olympics, Hoy became the most successful Olympian in British history by winning his fifth and sixth gold medals in the keirin and team sprint events
Chris Hoy
Hoy held a news conference in his home city of Edinburgh on Thursday to announce his retirement. "It was not a decision I took easily or lightly, but I know it's the right one."