The second event on the USA Cycling Gravity Mountain Bike National Calendar (MBNC) happened at the Chalk Creek Stampede in Nathrop, Colorado this past weekend. Aaron Gwin and Joanna Petterson won the dual slalom while Petr Haওnak and Petterson won the 4X race. In the non-gravity events, Jay Henry and Jennifer Smith won both the short track ඣand the cross country races. See for all four disciplines at the Chalk Creek Stampede or check out (briefs posted below) for the USAC National Gravity calendar.