I'm surprised I haven't seen this discussed yet:
https://www.cyclingnews.com/news/team-gb-to-use-small-pitch-chains-worth-pound450-in-tokyo-olympics-velodrome/?utm_medium=social&utm_source=facebook.com&utm_campaign=socialflow&utm_content=cyclingnews&fbclid=IwAR3mNyB1aJgf69cVybxn7b8_hrjX9e3ji9Xt6nM_fBFK9jIy09ab8BLyQkc
Louis :-)
https://www.cyclingnews.com/news/team-gb-to-use-small-pitch-chains-worth-pound450-in-tokyo-olympics-velodrome/?utm_medium=social&utm_source=facebook.com&utm_campaign=socialflow&utm_content=cyclingnews&fbclid=IwAR3mNyB1aJgf69cVybxn7b8_hrjX9e3ji9Xt6nM_fBFK9jIy09ab8BLyQkc
Louis :-)