| Listed in parts books | Not catalogued by year yet |
BSA REAR SPROCKET A10 42T
Rear sprocket, 42-tooth, for the BSA A10 final drive.
This is a rear sprocket for the BSA A10, a 42-tooth unit built for that model's final drive. The catalog listing calls out the A10 specifically, and one of our other catalog references also ties this same tooth count to the A65, so it may see use across both, but the A10 is the model the description names outright.
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The rear sprocket bolts to the wheel and takes the drive from the final chain, setting the gearing along with the size of the front gearbox sprocket. A 42-tooth count is on the larger side for a rear sprocket, which generally means quicker acceleration at the expense of top-end speed compared to a smaller tooth count.
This part number doesn't show up in our own parts-book records beyond the basic listing, so we're going on the description alone. If you're sourcing this for a BSA A10, or possibly an A65, check tooth count and bolt pattern against what's currently on the bike before you order.
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