cant quite remember but i think you can get a 55/25 in there which will give you the best.
but if your going for a 17.5 you need to watch, what your final ratio will be
bepending on what speedi a motor you cant go any lower than 3.5
but have a look at your interal ratio and / 55/25 * by interal ratio giving you final
but if i wear you i would go the gear option and get what you can out of the car
and put the 17,5 in something that can handle the power
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