Hello,
Regarding this optional 22 pulley gear, if you install it in the front on the outside of the pulley shaft, you can change the, sorry for this french word, Preponderance, i don't know if it is the same word in english.
So if you put on it this 22 pulley gear, the diameter of the front wheels and the rear wheels must have a difference of 3mm. For exemple in the front 60mm and in the rear 63mm.
So the front wheels are more driving than the rear, and the car is more effective and easy to drive.