Triumph 18T , 19T of 20T versnellingsbak tandwiel , T120 / T150/A75 (4 bak) 57-1917 ,
Gearbox sprocket for Triumph TR6,T120 etc 1963-74,
T150 1969-72, 4 speed models, and BSA A75 Rocket 3, 4 speed models.
Chain Pitch: 5/8'' x 3/8''
Number of Teeth: 18T , 19T or 20T