The Type I track causes more of a bouncy ride on flat surfaces, like concrete. However, the design (with the knobs in the center) allows for more durability in slippery or sticky types of terrain (like red clay, mud or wet snow). The Type II track is a smooth ride, with very little bouncing or jarring feeling on concrete. However, the grooves can more easily fill up with wet snow or red clay mud and decrease traction. All other types of terrain are just as easily accessed, like sand, ice, dirt, gravel, etc.