I used the internal gear ratio as 2.6, which I think is correct.
Then did the internal gear ratio divided by the number of tooth on the pinion, then multiplied that by the number of teeth on the spur.
Therefore 2.6/21=0.124, then 0.124*83=10.28
That's how I worked mine out anyway and its been spot on so far, coming off barely warm, quite unusual for an X12!
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