| Listed in parts books | Not catalogued by year yet |
COUNTERSHAFT SPROCKET 15T
Triumph countershaft sprocket, 15 tooth, part number 57-1555/15, drives the final chain off the gearbox output shaft.
This is a countershaft sprocket, 15 tooth, carrying the Triumph part number 57-1555/15. It's the small sprocket that mounts on the gearbox output shaft and drives the final chain back to the rear wheel sprocket. Tooth count on a countershaft sprocket is one of the main levers for overall gearing, so a 15T is a specific ratio choice rather than a one-size-fits-all part.
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Our catalog record on this one is brief, so we can't tell you from here which specific model or year range it was cataloged against. Check the tooth count and shaft fitment against what's currently on your gearbox before ordering, and give us a call if you want help confirming it's the right one for your setup.
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