Yes, I've used the calculator, but the problem is that a calculator doesn't said which is the best possible (theorerically) value given a specific motor.

I mean, I can enter different values and get a total gear ratio and, consequently, an evaluation about top speed. But how can I find the best ratio to be used ? Is, for example, a ratio of 13 : 1 suited for a motor like the 1717 ? Is the motor so powerfull that i can, lets say, lower the ratio down to 10 : 1 ?

I don't have any specific requirements about top speed. My only concern si to be able to use the motor at its best.

Bye, Andrea