AFAM uses the best alloy steel available to produce their front sprockets. Minimum tolerances combined with the race-proven AFAM tooth profile guarantee the quality you demand for your high performance bike. / Fitment: Triumph: 17-19 900 Street Cup; 17-21 900 Street Scrambler; 16-21 900 Street Twin; 17-21 T100 900 Bonneville; 17-20 T100 900 Bonneville Black