| Diagram | Fig. 5 — OIL PUMP, GEARBOX SPROCKET · ref 4 |
| Subsystem | gearbox |
| Listed in parts books | 1969–1970 |
BSA Gearbox sprocket (17 teeth)
A 17-tooth gearbox output sprocket for a BSA gearbox, part number 68-3072.
This is a 17-tooth gearbox sprocket, the piece that sits on the end of the gearbox mainshaft and carries the final drive chain out to the rear wheel. It's what the catalog lists under figures for the oil pump and gearbox sprocket area, so it lives right there at the outer end of the box where the chain picks up drive.
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Our records show this number turning up across catalog entries from 1969 into 1970, tagged to a BSA gearbox rather than a Triumph one. The tooth count is the main spec we can confirm - 17 teeth - which matters for your overall gearing, so check it against what's currently on the bike before you swap it in.
If you're chasing a sprocket for a gearbox rebuild or a gearing change, this is the part number to have in hand at the counter. Bring the old one along if you're not sure it's the same count, since sprockets that look close can be off by a tooth or two.
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