`- Kick-shift 2-speed hub with coaster brake\n- Benefits include its simple backpedal-action shifting/braking and no cables or shifters\n- 6061 aluminum hub shell with 13/32" slotted solid axle (162mm overall axle length) \n- Gear ratio range of 138% \n- Includes 22 tooth 3-spline cog\n- Optional: matching front track hub, use UR-5501