It's important to remember that a 1 or 2 tooth jump in the lower gears is the equivalent of a 2 or 3 (or more) tooth jump in the larger gears. So, going from 11 to 12 (a 1 tooth jump, but 8.33% change) has the same impact as going from a 31 to a 34 (a 3 tooth jump, but about the same amount).


That's why there are small jumps in the smaller gears and then progressively larger jumps in the larger gears.