Jul 15 2018: Isaac Shamblin places 12th at the Men Cat 4/5 Race at the Shelby County Grand Prix - Sunday RR in a group sprint

Jul 14 2018: Isaac Shamblin places 11th at the Men Cat 4/5 Race at the Shelby County Grand Prix - Saturday RR in a group sprint

Jul 14 2018: Isaac Shamblin wins the Men Cat 4/5 Race at the Shelby County Grand Prix - TT in a group sprint