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Re: Help with gear sizes
The total number of teeth needed on the two gears need to add up to 84. The 11 & 13 tooth pinions (smaller of the two gears) shown on linked site are a special case. They cut on 12 & 14 T diameters respectively. The big gear is either 70 or 72 based on commonly available cim pinion gears.
A 72 t gear on a 4" wheel is a risky proposition. Any trash picked up from the floor will jam the gears. Gears are trash magnets.
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If you don't know what you should hook up then you should read a data sheet
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