Laura Trott has revealed that she promised to buy her sister Emma a car if she won two golds at the Games.
Giggling, Trott told BBC Breakfast: "I hope she's got a budget, there'll be no Ferraris, I'm telling you."
Talking about the future as she appeared on the sofa with six-time Olympic champion Sir Chris Hoy, Trott joked: "I could beat him, eh?"
More top news
A report warned overcrowded streets could lead to a 'Hillsborough scale' tragedy.
The PM confirmed an end to the country's existing trading arrangements as she outlined her 12 priorities for negotiating Britain's EU exit.
Theresa May has pledged to invoke Article 50 by the end of March, beginning the Brexit process. Here is an A to Z of what you need to know.