Sir Chris Hoy said he is stepping down today because it is time to let a younger rider shine.
He told reporters: "Nothing would have given me more pleasure than to continue on for another year, to be there in Glasgow to represent Scotland, to be part of the team.
"But I just feel that I don't want to be there just to make up the numbers I want to be there to be competitive and being objective about it I realise I got everything out in London, so I think it would be better to let a younger rider come through to give them chance to shine."
More top news
A car bombing outside a popular ice cream parlour in Baghdad has killed 13 people and wounded 24.
Both Theresa May and Jeremy Corbyn have been forced to defend their records and answer tough questions from an audience in a TV grilling.
Patchy rain affects northern areas of the UK in the next 24 hours. Elsewhere, dry but rather cloudy.