u can run a 16t on it IF! u are running abs or pvc tyres as there is less stress on the esc. my bro uses a 17t on his and i no a guy that runs a 14t on his. that being said u might want to keep an eye on the temp just in case. test it out first do a bit of circle work and touch the esc if its getting way hot then i wouldnt rekomed continuing doing it.