| Also known as | PS231 |
| Listed in parts books | Not catalogued by year yet |
CHAINWHEEL,ALLOY PREUNIT
Alloy chainwheel for pre-unit Triumph primary drive, PN 57-1549A (aka PS231).
This is the alloy chainwheel listed for pre-unit Triumphs, part number 57-1549A, also catalogued as PS231. A chainwheel is the sprocket that rides on the gearbox mainshaft or clutch assembly and carries the primary chain, so it sits inside the primary chaincase where the engine's drive gets handed off to the clutch.
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Our records on this one are thin beyond the basic listing, so we can't speak to specific dimensions or which pre-unit models it was cataloged against year by year. If you're matching up a primary drive setup, give us a call with your bike's details and we'll confirm fit before you order.
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