| Listed in parts books | Not catalogued by year yet |
PRE UNIT C/S SPROCKET UK
Pre-unit Triumph gearbox countershaft sprocket, part 57-0471/21 (also listed as SPRPU/21T).
This is a gearbox mainshaft sprocket (often called the countershaft sprocket) for pre-unit Triumph gearboxes, listed in our records as 57-0471/21 with the older-style part number SPRPU/21T also on file for the same piece. The catalog entry we have is brief and doesn't spell out which specific model years it was cataloged against, so treat this as a pre-unit gearbox part and confirm it matches what's on your bench before you order.
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The number 21 in the alias points to a tooth count, which is a detail worth double-checking against the sprocket you're pulling off, since gearbox sprockets in this family come in more than one tooth count depending on final drive gearing. Beyond that we don't have more detail on this one in our records.
Give us a call if you want to talk through fitment before ordering — better to confirm than guess on a gearbox internal part.
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