2019 Race Information Manteno Triathlon and Duathlon will be held at Manteno Sportsman's Club on July 27, 2019. There are no refunds or transfers for races or club events. Register Now USAT Race Rules Click here for current race rules 2018 Race Photos Log in to runsignup.com. Find Manteno Tri and Du Races, then go to "Photos" under the "More" menu. 2018 Race Results Click to view recent race results Indoor Workout Challenge Click here for more information and to sign up for the 2019 Indoor Challenge.