Red Onion chef John Quigley revealed on Facebook that the British cycling legend "sprinted down Bath Street" to give the lady her bag back after she left it on a table next to the star who was dining in the restaurant.
John said: "So if you're gonna do a selfie at the Games then it has to be with the one and only auld Thunder Thighs himsel. What a gent as you would imagine too.
"Lady at table next to him left her bag and he sprinted down Bath St to reunite her with it."
Quigley also revealed that Sir Chris loved his scallops and monkfish.