Question

Count the teeth in the front and rear gears in speeds 1, 5, 6 and 10 for a ten-speed bike. Record your data in the table and figure the ISA (speed advantage) and the IMA (mechanical advantage)for each speed. (The diagram shows a rear gear with 34 teeth and front gear with 52 teeth.)

Answer 1

Sorry; my bike is 24 speed.

The front and rear gears usually have more than one sprocket, with different numbers of teeth on each.

This is an exercise you should do with your own bike.

I don't know of any derailleur bike that "numbers" its speeds.