| Also known as | W3585 |
| Diagram | Fig. 18 — REAR WHEEL · ref 11 |
| Subsystem | wheels |
| Listed in parts books | 1970, 1974 |
BRAKE DRUM/BOLT ON SPROCKET - CEI THREAD
Rear brake drum with bolt-on sprocket, CEI thread, for Triumph twins.
This is the rear brake drum for Triumph twins, the bolt-on sprocket type with a CEI thread. It sits in the rear wheel assembly, where it works with the brake shoes to slow the bike down, and it also carries the rear sprocket that the final drive chain runs on. The legacy alias W3585 is the older form of the same part number.
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The CEI thread callout in the catalog description matters here — make sure whatever sprocket carrier or hub components you're pairing this with match that thread standard before you bolt things together. This part shows up in rear wheel figures across catalog entries from the early-to-mid 1970s.
If you're sourcing this to replace a worn or cracked drum, it's worth checking your existing part closely against this one before ordering, since rear brake drums varied across the Triumph twin lineup and getting the thread type wrong means it won't thread up right on the hub.
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