So if my drive gear is gray (and it has to be because there isnt another close to it: gray, red, blue, yellow, brown), and if the driven gear is either 19 (dark aqua), 34 (light green), or 42 (green), then the gear ratios are:
15/19 = 0.7894736842105263
15/34 = 0.4411764705882353
15/42 =...