Small Silent Durable Racing SPROCKET Fly Front Mute Sprocket Pinion for CFmoto 450 SR NK MT 450SR 450NK 450MT matched Fit For CFMOTO 450SR 450NK 450MT engine output shaft drivetrain assembly Direct bolt on fitting; no or extra needed during chain system Built in mute buffer rubber ring design; lower friction noise for quiet daily commuting track racing carbon forging with frequency quenching; hardened teeth resist abrasion under speed racing load Standard inner spline dimension same as OEM; stable power transmission without slipping or abnormal vibration