SIGMA Cup 16th Anniversary Greg Biffle was an awesome dude, and we here at SIGMA have decided to dedicate 2026 to Greg Biffle. SIGMA's 16th anniversary is the Year of the Biff! 16 Years of Excitement! NAVIGATION Active Standings (2025) Past Season History SIGMA Paintschemes SIGMA Biggest Races SIGMA Lore To learn more, join our Discord! SIGMANR2003DISCORD!