It's all about horse power. Haulers, extremes and rippers. If you run under 100 hp, stay with extremes. Tires will rob HP if you can't turn them. That's a fact! 4 mil 10 paddle, 421, 12 paddle, maybe? 10 mil, maybe rippers if you spent big bucks on a motor.. After that, good luck. Try them and see what works best.