Nation SD governor criticizes study suggesting Sturgis bike rally led to 260,000 COVID-19 cases September 8, 2020 Megan Raposa, Sioux Falls Argus Leader Comments Off on SD governor criticizes study suggesting Sturgis bike rally led to 260,000 COVID-19 cases A study by a California research group estimates that the Sturgis motorcycle rally in South Dakota led to more than 260,000 coronavirus cases.