Named after Portland, Oregon, the home of the Cross Crusade the largest participant cyclocross series in the world , the PDX is an all-around performer with a particular love for mud The center knobs are aligned to give you a fast roll on hard pack and pavement. Side knobs offer superior edge control so your bike stays under you in the curves, and the leading edge of the knob gives you extra traction coming out of corners Aggressive knobs, widely spaced for mud clearing, but still fast rolling The original mud tire Named after Portland, Oregon, the home of the Cross Crusade the largest participant cyclocross ser The center knobs are aligned to give you a fast roll on hard pack and pavement. Side knobs offer su Aggressive knobs, widely spaced for mud clearing, but still fast rolling The original mud tire