08 nitro, 3.7 6 spd. man. 2x4. the sticker on the door calls for 225/75r16s...... it has 235/70r16s on it now........ has anybody put a 245/70 or a 245/75 on a stock suspension nitro?? right now the speedometer reads 2 miles slower than the vehicle travels.....40 mph your actually doing 38 mph...... don't really care about the speedometer.... but i'd like to put a slightly bigger tire on it for highway travel.