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
Donald Trump's ambiguous phrase "what's happening in Sweden" during a rally on Saturday was a reference to a Fox News story, he has claimed.
Donald Trump's revised immigration ban targets the same seven Muslim majority countries listed in his original executive order, sources say.
People convicted of cruelty against animals should face much harsher prison sentences, some charities have claimed.