Sir Chris Hoy has spoken to ITV News about his triumph in the Men's Keirin Final on Tuesday.
He said he had been "blown away" by the whole day and it was "the greatest experience of my whole career".
He added: "This is what you train for, and aspire to achieve but when you actually do it is very hard to take it all in."
More top news
The families of all four of the victims, all of whom were men, have been informed, police said.
A motorcyclist from Nottingham has died in an accident at the Macau Grand Prix in China, earlier today.
AC/DC co-founder and ex-guitarist Malcolm Young has died aged 64, his publicist has announced.