| Diagram | Fig. 5 — OIL PUMP, GEARBOX SPROCKET · ref 4 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1971 |
COUNTERSHAFT SPROCKET,18T
An 18 tooth countershaft (gearbox) sprocket, part number 68-3093, for the final drive chain.
This is the 18 tooth countershaft sprocket, part number 68-3093, sometimes called the gearbox sprocket. It sits on the gearbox output shaft and carries the final drive chain back to the rear wheel sprocket, so it's the link between what the transmission is doing and what the rear wheel actually sees.
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Our records on this one are thin on Triumph-specific catalog history, and the grounding we have points this part at BSA A50 and A65 twins rather than a Triumph model. If you're chasing this number for a Triumph gearbox, it's worth double-checking your parts book against the actual number stamped or listed for your bike before you order, since the same tooth count and chain pitch can show up across different marques without being the same physical part.
Going to an 18 tooth sprocket from a higher tooth count changes the gearing, something to think about if you're chasing a particular final drive ratio. Give us a call if you want to talk through fitment before this one lands in your basket.
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