| Listed in parts books | Not catalogued by year yet |
COUNTERSHAFT SPR.19T B25
19-tooth countershaft sprocket for the BSA B25 gearbox.
This is a countershaft sprocket, 19 tooth, listed for the B25 model. The B25 is a BSA, not a Triumph, so if you're working on a Triumph gearbox this one isn't your part — it's here because the shop's catalog carries BSA gearbox components alongside the Triumph line.
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The countershaft sprocket sits on the gearbox output shaft and carries the final drive chain out to the rear wheel sprocket. Tooth count on this style of sprocket affects overall gearing, so if you're chasing a specific gearing change on a B25 this is one of the parts that plays into that.
Our records on this one are thin — we don't have more detail beyond the catalog line itself. Call the shop and we can confirm fitment before you order.
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