| Listed in parts books | Not catalogued by year yet |
GEARRBOX SPROCKET 21T - 4 SPEED TRIUMPH 64-72 - UK
A 21 tooth gearbox mainshaft sprocket for the Triumph four-speed gearbox, UK-spec, 1964-72 catalog listing.
This is a gearbox sprocket, 21 tooth, for the four-speed Triumph gearbox. It's the sprocket that sits on the gearbox mainshaft and carries the final drive chain back to the rear wheel, so it's a key part of getting power from the transmission to the road.
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The catalog lists this as a UK-market part appearing in records that span 1964 to 1972 for the four-speed box. It's also known under the alias SPR-4SP21T if you're cross-checking against an older parts list.
When you're ordering, check tooth count and chain pitch against what's currently on your bike before swapping one in, since sprocket sizing affects your overall gearing.
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