| Diagram | Fig. 16 — REAR WHEEL · ref 13 |
| Subsystem | wheels |
| Listed in parts books | 1969 |
REAR SPROCKET B25 10 HOLE 49T 520
Rear sprocket, B25, 10-hole pattern, 49 tooth, for 520 chain.
This is a rear sprocket listed for the B25 model, a 10-hole pattern with 49 teeth, set up for 520 chain. The description we have is short and doesn't tie it to any particular Triumph unit-twin fitment, so we're passing along exactly what the catalog shows rather than guessing beyond it.
Read more
Given the B25 designation in the description, this looks like it was cataloged for a BSA-family machine rather than a Triumph model, even though it sits in our Triumph numbering system. If you're trying to match this up to your bike, give us a call with your hub and chain details before you order so we can confirm it's the right one.
We don't have more detail on this one beyond the tooth count, hole pattern, and chain size stated in the listing. If you need more background on where it fits, reach out and we'll try to run it down.
Sorry if we got something wrong here. If you think this information isn't correct, .