Gravel riding is a bicycle category that encourages adventure cyclists to experience more than only paved roadways. Ron Miriello together with Claudio Marinangeli (Eroica Gaiole) and Marco Brunetti, organized the very first gravel bicycle race in Italy. 100 Miglia is held annually in the Tuscan mountain village of Radicondoli, near Siena, Italy. 100 Miglia, or 100 miles, is an annual race that attracts cyclists from around Europe.