| Diagram | Fig. 19 — REAR WHEEL · ref 16 |
| Subsystem | wheels |
| Listed in parts books | 1969–1970 |
BSA Rear chain (5/8" × 3/8" × 105 pitch)
Rear drive chain, 5/8 in. by 3/8 in. pitch, 105 pitches, from the REAR WHEEL parts-book listing.
This is the rear drive chain, listed in the catalog as a 5/8 in. by 3/8 in. chain with 105 pitches. It sits back at the rear wheel, carrying power from the gearbox sprocket down to the rear hub and putting the drive to the ground.
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The catalog ties this one to the REAR WHEEL figure, with appearances in the 1969 to 1970 range. If the description says BSA rather than Triumph, that's worth noting - check the part against your own machine before you order, since chain length and pitch have to match your sprockets exactly or the chain won't sit right on the wheel.
If you're replacing a stretched or worn chain, it's worth pulling and checking your sprockets at the same time. A tired chain running on tired sprockets wears both out faster, and nobody wants to do this job twice in one season.
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