IRIS X-Ring chainset with sport sprocket (S), Ducati 939/950 Super Sport (S), 17- Article: IRIS Kette & ESJOT Räder X-Ring chainset Ducati 939/950 Super Sport (S), 17- Article: IRIS Kette & ESJOT Räder X-Ring chainset Ducati 939/950 Super Sport (S), 17-