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
Temperatures set to slide
The announcement was hailed as a "momentous step" that will help families facing financial stress as they come to terms with their loss.
Pop Idol's Michelle McManus has joined 10 choirs to record a charity single that they hope will make Christmas Number One.