Even if you cant find out its dead easy to work it out.
Put a line on the tire and the tailshaft.
Lie underneath it and get a mate to push it one turn of the tire
Count the number of tailshaft revs.
eg. 4.1 tailshaft turns for one wheel rotation your ratio is 4.1:1
Done.... absolutely no doubt left.
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It seemed like a good idea at the time........
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