Please check the image for a larger view. Pinions and spurs needed to change gear ratios depending on the course. Pinion 64P 49 - 2 pieces, 47 - 1 piece, 41 - 1 piece, 40 - 2 pieces, 39 - 3 pieces, 38 - 3 pieces, 37 - 1 piece, 36 - 2 pieces 35 - 2 pieces, 34 - 3 pieces, 33 - 2 pieces, 31 - 2 pieces, 30 - 1 piece, 29 - 3 pieces, 26 - 2 pieces, 25 - 1 piece 24 - 1 piece, Total 34 pieces Necessary items for preferred setup.