Ive tried most all of the Artrax tires and Ive yet to lose a knob on any of them. This SX2 tire is supposed to be for soft terrain but its not the best tire ive found for soft, the TG 4 blows it away for loose dirt but where this sx2 really shines is hard dirt like blue groove clay. Its predictable and gets respectable traction. The Tg4 rear on hard terrain is very slippery. Im running the 120 width which is comparable to a 110 by any other manufacture. Its on a 2013 KX450f . Im using this sx2 solely on my practice track here in Michigan which is a mixture of sand and clay so I have a little bit of every type of dirt in it. I use other tires for Racing .