I had the shreaders on my quad b4 and i loved them. they break free sideways and grab when you are goin straight. also really light so if you ride rocky terain the bandits will be better. bandits are what i have now and they are super strong but heavy. 18's if you ride smooth trails and sand. 20's if you ride rocky or rooty trails and like more top end the 18's will give ya more bottom end