2025 San Diego Underground

Think you've got the fastest lines in SD? Prove it. The San Diego Underground is officially ON and ends September 1st (Labor Day). We're talking real-deal trail domination - track your rides, smash segment times, and climb the leaderboard. No starting line, no waiting, just ride hard, log your time, and let your speed do the talking. Weather you're a trail crusher or just stoked to ride with a purpose, this is your chance to carve your name into San Diego Onewheel scene.