Kolettis competed in the 10 and 100 kilometres races. He finished second in the 100 kilometres, behind Léon Flameng of France. Kolettis and Flameng were the only two to finish. When Flameng crossed the finish line, Kolettis had completed 289 of the 300 laps required. In the 10 kilometres race, Kolettis quit after 7 kilometres due to injuries sustained by colliding with countryman Aristidis Konstantinidis two-thirds of the way through the race.