| Also known as | W4046 |
| Diagram | Fig. 22 — REAR WHEEL · ref 16 |
| Subsystem | wheels |
| Listed in parts books | 1972–1974 |
Sprocket—50 teeth
Triumph 50-tooth rear wheel sprocket, part number 37-4046 (also known as W4046).
This is the 50-tooth rear wheel sprocket, Triumph part number 37-4046 (also listed under the older W4046 designation). It bolts to the rear hub and is what the final drive chain rides on to actually turn the back wheel. Tooth count matters here — 50 teeth is a specific gearing choice, so if you're swapping one in, count the teeth on what's coming off before you order.
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This one shows up in the parts books under the REAR WHEEL figure, and our catalog records span appearances from 1972 through 1974. Beyond that we're going by what the figure title tells us — it's a rear wheel component, not a gearbox or engine sprocket.
If you're replacing a worn sprocket, it's worth checking your chain and the corresponding front (engine) sprocket at the same time, since a badly worn one can chew through a new sprocket fast. Confirm tooth count and hub fitment against what's currently on the bike before you place the order.
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