520361 Transmission sprocket, 21t

This 21-tooth transmission sprocket is specifically designed for the later 4-speed Big Twin models produced between 1980 and 1985. During this transition period, Harley-Davidson made several updates to the drivetrain, and this MCS sprocket is built to match those specific requirements. It provides a reliable connection between your transmission and the rear wheel, ensuring smooth power delivery. A 21-tooth count offers a balanced gear ratio for the late Shovelhead and early Evolution 4-speed bikes. It is a heavy-duty part that we often use for routine replacements when the original sprocket teeth start to show signs of hooking or excessive wear.