Triumph Pre-Unit Twins Front Drive Sprocket 57-0471 Sprocket Size:19T I highly recommend replacing it

I highly recommend replacing it with our new units

Harris which means it is O

If you rebuilding your Cylinder Head

You won't find a better price or quality on these BSA Black Diamond Valves

Triumph Pre-Unit Twins Front Drive Sprocket 57-0471 Sprocket Size:19T I highly recommend replacing itNew Triumph 650 Pre Unit Twins Front Drive Sprocket. This EMGO sprocket is the same quality as the "English made" types for half of the price. Sprocket accepts a standard 530 or 5 8" X 3 8" chain. Use the drop down menu to select which size sprocket you need. Fits the Triumph 650 Pre Unit twins (Bonneville, T120, 6T, T110, TR6SS, etc) from 1947 1962. Also fits Triumph 500 Pre Unit twins up to approx 1956. Please refer to your parts catalog for proper