23 pinion to start? standard spur?
Does it give any recommendations for overall ratio in the manual? If so it can be worked out by:
Spur/pinion ration = external ratio
External Ratio x Gearbox ration = overall ratio...
e.g. 81/23 = 3.52
3.52 x 2.6:1 = 9.12 (overall ratio!)
HTH
Mark
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