| Listed in parts books | Not catalogued by year yet |
ENG SPROCKET A10 18T 428
18 tooth engine crankshaft sprocket for BSA A10, sized for 428 chain.
This is an engine sprocket for the BSA A10, not a Triumph part despite the number sitting in our Triumph-numbered stock. The catalog description calls it out plainly as an A10 engine sprocket, 18 tooth, for 428 chain. It mounts on the crankshaft end and is what the primary chain rides on to carry power from the engine to the clutch.
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We don't have much more on file for this one beyond the tooth count and chain pitch. If you're restoring an A10 primary drive and need to confirm this is the right sprocket for your engine and chain setup, give us a call before you order.
Worth keeping in mind that gearing changes when you go up or down a tooth on a crank sprocket, so make sure 18T is what your bike is set up for before swapping it in.
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