| Also known as | D438 |
| Diagram | Fig. 14 — CHAINCASE AND ALTERNATOR · ref 27 |
| Subsystem | primary |
| Listed in parts books | 1960–1962 |
Rear chain (5/8" x 3/8" x 99L)
Rear drive chain, 5/8" x 3/8" pitch, 99 links, cataloged for 1960-1962 Triumphs.
This is the rear drive chain, listed in the catalog as 5/8" x 3/8" x 99 links. It shows up in the chaincase and alternator figure, so it's the chain that carries power from the gearbox sprocket back to the rear wheel, running along the left side of the bike under the chainguard.
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The old book number for this one is D438, which is the same physical part as 60-0438 under Triumph's earlier lettered numbering. If you're working from an older parts book and see D438 called out, that's this chain.
Our catalog record ties this to appearances across 1960 through 1962. Chain wear is something to keep an eye on regardless of age - check slack and look for stiff links before you put many miles on it. If you're not sure this length and pitch matches what's currently on your machine, give us a call and we'll help confirm before you order.
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