Hi Bryn,
The Overall ratio guide is in the manual.
Basically.
(Spur/Pinion) x 2.4375 = Overall Ratio.
e.g.
(80/19) x 2.4375 = 10.26
(80/18) x 2.4375 = 10.83
These 2 ratios shouldn't be far off. Depends on the make of motor though. You batts will make a difference too.
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5 Time Oople Invernational SC Champion.
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