| Also known as | W1040 |
| Diagram | Fig. 21 — QUICKLY DETACHABLE REAR WHEEL (NOT U.S.A.) · ref 19 |
| Subsystem | wheels |
| Listed in parts books | 1964–1969 |
Sprocket and brake drum 46T
Combined 46-tooth rear sprocket and brake drum for the quickly-detachable rear wheel.
This is the combined sprocket and brake drum unit for the quickly-detachable rear wheel, cut with 46 teeth. On the QD wheel setup, the rear sprocket and the brake drum are one piece rather than separate components, so this part carries both the chain drive teeth and the braking surface the shoes work against inside the hub. It shows up in the parts book under the QUICKLY DETACHABLE REAR WHEEL figures, both the US and non-US versions, across catalog listings running 1964 to 1969.
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The older reference for this part is W1040, the letter-prefix form used before the numeric system took over, so if you're working from an early parts book that's the number you'll see instead of 37-1040.
Because this is a combined drum and sprocket, wear on either the teeth or the braking surface means replacing the whole unit, not just one half. Check tooth condition and drum bore wear before ordering, and confirm your rear wheel is actually the quickly-detachable type before you buy, since a standard rear hub uses a different arrangement.
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