Well Josh ran a 54 and was lethal with it. But he did run over as many trees as he went around!!! It was a great working setup with 140 lbs of Josh on board. However, Don, Dale, DJ and myself all run 163s. Side by side comparison, switching sleds we all agreed (Josh included) that the 63 on an XP platform worked better in the technical riding. It will just pull on top quicker and keep trenching longer than the shorter track. Not sure what Norm and Dave are running...haven't ridden with them. Any track can work. People that think a 163 doesnt work as well as a shorter track because it doesnt flick around enough are wrong. Plain and simple. I believe that in the right hands a 174 can snake through the trees. The problem that I can see is whether or not a stock or near stock powered sled can build QUICK enough track speed with that much track. Im going to go riding with Mr Hooch and I will report back. I will say that under some conditions the quicker track speed of the 54 was an advantage. Logger155, who are you??