EV gear spec sheet
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This Chart gives you the distance between 1/8" holes for proper gear function.
note: 12t is for motor only 40t is also drive wheel size
Gear 1 Gear 2 distance between centers 12 20 5/8" 12 30 13/16" 12 40 1" 20 30 1" 20 40 1 3/16" 30 40 1 3/8" Combinations from the following gears 12t, 20t, 30t & 40t
2 gears in combination
12:20 3:5 12:30 2:5 12:40 3:10 20:12 5:3 20:30 2:3 20:40 1:2 30:12 5:2 30:20 3:2 30:40 3:4 40:12 10:3 40:20 2:1 40:30 4:3