Philippa York was arguably the most celebrated British bicycle racer of the 20th century. Yet, when she turned up to watch a race in Switzerland this spring, York realized it was her first time attending a bicycle race in the 21st century. York, 59, formally rejoined Britain’s sporting world last year as the world’s first known transgender professional cyclist, active or retired. She unveiled a column for the popular British website Cycling News and accepted an invitation to commentate on the Tour de France for British television, a role she will reprise in July. These past 12 months, York has been celebrated across Britain.