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Since the snow is trapped between the top and bottom of the lug, and gets pushed out the side of the lug, the wider the lug, the further the distance the snow has to move in order to no longer be resisting the pressure of the lug. With four lugs across, the lug width on a 15" wide track is about 3.75", with the average distance that the snow has to travel to be expelled is 3.75"/4 = 0.94". With 3 lugs across, the lug width is 5" with the average distance of snow travel is 1.25". So the 3 lug track is 1.25/0.94 = 1.33 times more efficient than a 4 lug series IV track. Some camoplast challenger lugs are also cupped, which helps trap the snow much better than a flat faced Series IV lug. Which further increases the track efficiency. When you put a CC 3 cupped lug track on, you will immediately notice the much stronger pull in deep powder.What's better about the Challenger track? Are the lugs more rigid? I know the series IV has 4 lugs staggered across the width of the track, where as the challenger track has 3 wider lugs staggered. Although a little shorter lugs, the Challenger really is better than a good condition series IV?