[gaminde]

I just made on of these its a divide by 1.5 or 2 setup. its just a chip that takes in 2 pulses and puts out one pulse from the speed sensor, you can also use a unipolar hall effect device rather than a bypolar hall effect in your speed sensor. it does work I went from 12 to 21 not much power works great going down hill, also takes off regen so going down hill there is no motor breaking!!
its rather high priced put you money somewhere else.