| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 22 |
| Subsystem | gearbox |
| Listed in parts books | 1974, 1979 |
GEARBOX SPROCKET 18T - 5 SPEED TRIUMPH 72-ON - UK
18-tooth gearbox sprocket for five-speed Triumph twins, UK-spec boxes from 1972 on.
This is the gearbox sprocket for five-speed Triumph twins, cut with 18 teeth. It sits on the end of the gearbox mainshaft where it drives the final drive chain back to the rear wheel. The catalog lists this one for the UK-market five-speed boxes that came in from 1972 onward.
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Gearbox sprockets take a beating over the years from chain wear and tension, so it's worth checking the teeth for hooking or wear whenever you have the primary or chaincase open. A worn sprocket will chew through a new chain fast, so if you're replacing the final drive chain it's a good time to look this over too.
We don't have much more detail on file for this one beyond the catalog listing itself. If you're not sure whether your box is the five-speed UK-spec unit this sprocket is cut for, give us a call before you order and we can confirm fitment.
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