cody your slash will be fine for 17.5 spec class if we have enough it however with the protrac kit u would not be able to run it in box stock class we only allow u to use whatever tire u want.In the case u dont have enough 17.5spec guys u would run mod and that 17.5 with some timing boost you will be good we usally have mod and box stock classes it all depends who shows and what they bring and im not alf im brandon hpoe this helped cody and didnt confuse you
