Chloé Dygert has launched a fundraising campaign to help former track cycling teammate Sarah Hammer-Kroening after the 42-year-old suffered a series of "medical challenges" over the past year, which have left her with significant medical bills.
Hammer-Kroening is one of US cycling's most decorated athletes, having won four silver medals in the Team Pursuit and Omnium at the 2012 and 2016 Games and won 12 track world titles between 2006 and 2016.
