I rode the gnarly rocks and switchbacks on the Stiles Ranch Trail in Santa Clara County’s Santa Teresa Park in south San Jose at Trailhead Cyclery’s Dirt Demo on November 8, 2015. This trail is upper intermediate technical difficulty and one of the best test tracks I’ve found outside of Moab. I hit every large rock I could target and avoided the best lines. Some rocks were 6″ or so in height and presented a vertical face to me. The rocks are spaced close to each other in many places so you hit them one after another will little time to prepare for the next. I never popped up my front wheel to climb them.