Kyosho OPTIMA gearing question?
 

Ok so I consider myself a bit of a numpty when it comes to figuring this stuff out but I would like to work out what ratio suits what motors etc... I have a few aftermarket 48dp and .6 module spurs and would like to better understand gearing and what underdrive and overdrive relates to on this car.
I intend to run both 540 silver can and at the other end low turn modifieds in some of my cars.
Thanks in advance-Jason