There are multiple tooth count options that can and will be installed in this odometer. You will need to count the teeth on the old gear before ordering. The outer gear will have 20 teeth, and the smaller inner gear will have between 21 and 32 teeth. If you cannot count the teeth on the main gear, then count the teeth of the next gear that it meshes with. If your tooth count is 49: 20x21, 48: 20x22, 47: 20x23, 41: 20x29, 40: 20x30, 38: 20x32