The Marquette Bike Jam is coming up soon. The Gravity Jam which will feature DH, Super D & Dual Slalom racing will be on Saturday June 30th at the Marquette Mountain Ski Hill. The Trail Jam XC mountain bike race will be on Sunday July 1st. The course will be on the South Trails and will include brand new trail that was built this Spring by the NTN. Marquette Bike Jam | Upper Peninsula Bike Race