| Listed in parts books | Not catalogued by year yet |
SPROCKET PRE-UNIT C/S 22T
A 22-tooth gearbox sprocket for pre-unit Triumph primary drive.
This is a gearbox sprocket for pre-unit Triumph engines, cut with 22 teeth. It's the front sprocket in the primary drive chain, mounted on the gearbox mainshaft, and it's what the primary chain wraps around before it drives the clutch and engine sprocket assembly.
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The catalog lists this under 57-0471/22, with the alternate reference SPR-PU22T also tied to the same part. Our record on this one is thin beyond the description itself, so if you're matching it to a specific pre-unit gearbox, check tooth count and shaft fit against what's currently on the bike before you order.
Worn or chipped teeth on a sprocket like this will chew up a chain fast, so if you're replacing this one it's worth looking at the condition of your primary chain and the engine sprocket at the same time.
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