keirin; Japanese track cycling race
A professional cycling event, typically 2 km, with a paced start behind a motorized pacer and a sprint finish. 競輪 is common in gambling contexts; ケイリン is often used for the sport itself.
He made a fortune on keirin betting.
Keirin became an official Olympic event.
My father often goes to keirin races.
I bet on keirin races together with a friend.
He once made a lot of money betting on keirin.
Every week I enjoy making predictions for keirin races.