USA Cycling has announced the 2009 American Mountain Bike Challenge (AMBC) calendar. The series kicks off March 8 in Gainesville, Fla. with the South Eastern Regional Championship Series (SERC) and concludes with the Piney Hills Classic in Ruston, La., Oct. 24-25. With 22 races across 16 states, the seven-month long AMBC calendar provides racers of all ability levels the opportunity to contest top-level competition right in their own backyard.