| Diagram | Fig. 11 — CLUTCH AND PRIMARY CHAINCASE · ref 32 |
| Subsystem | primary |
| Listed in parts books | 1970–1972 |
CHAINWHEEL BSA A65 1966-72 - Replaces 68-3272
Clutch chainwheel for the BSA A65 primary drive, PN 57-2773, replaces the earlier 68-3272 number.
This is the clutch chainwheel for the BSA A65, the sprocket that carries the primary chain drive into the clutch assembly. It lives in the primary chaincase, on the clutch side, and it's what the engine sprocket's chain wraps around to spin the clutch basket. Our catalog lists this as PN 57-2773, replacing the earlier 68-3272 number - if your parts book still shows the old number, this is the same physical piece under new numbering.
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The catalog record ties this to the BSA A65 across 1966-72. It shows up across a few different primary cover and clutch figures in our records, which lines up with how central this part is to the whole clutch and primary chaincase assembly.
This is a BSA part, not a Triumph one - worth flagging since a lot of primary and clutch hardware from this era gets mixed up between the two makes. If you're not sure whether your bike takes this exact chainwheel, give us a call before you order.
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