| Also known as | W951 |
| Diagram | Fig. 20 — REAR WHEEL · ref 8 |
| Subsystem | wheels |
| Listed in parts books | 1964–1965 |
REAR BRAKE DRUM/SPROCKET 46T - SPOOL HUB 500/650 TILL 1970 - UK MADE
Combined rear brake drum and 46 tooth sprocket assembly for the spool hub rear wheel on 500/650 twins up to 1970.
This is the rear brake drum and sprocket assembly, a combined unit built onto the spool hub used on 500 and 650 twins up through 1970. It carries a 46 tooth sprocket for the final drive chain and doubles as the drum surface the rear brake shoes work against, so it's doing two jobs on one piece rather than running a separate drum and bolt-on sprocket.
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On these older spool-hub wheels the sprocket and drum aren't separate pieces you can swap independently - they come as one assembly, which is how this part is cataloged. It's UK made and shows up in our records tied to the rear wheel figure for this era of bike.
The older parts book form of this number is W951, so if you're working from that reference and came up with W951, this 37-0951 is the same part under current numbering.
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