An aggressive yet well rounded downhill and gravity tire with well spaced partially hollow and siped tall knobs for extreme grip. RSR - Building on the impressive original the new RSR compound is a dual layer tread rubber with the soft RSR compound on top and the stiff SRC on bottom. AEC - Using the same 3-piece Aramid inserts as the AGC casing AEC omits the apex at the bead: for the same high level of puncture and cut resistance but without the added weight