I have removed all idler wheels except the front inside ones, too lazy to take the cross shaft out. I am running only 2 wheels in the rear. I have Simmons Gen I with cooling fins and rail mount ice scratchers. Mainly have been running trails so far, just not enough snow to do much off trail here. 500 miles and no sign of wear. A couple of times I got a little nervous because of conditions, but all is good.