Pressure and rim data can only tell SILCA so much about what happens when a tire actually meets loose, technical ground, and the Protocol RCG-4 tire is where that remaining variable gets solved in tread. Its knob pattern sheds mud rather than packing it, keeping traction and control intact on rough, loose terrain where a shallower tread starts to clog and slide. What Our Gearhead(R) Experts Are Saying:"I reach for the RCG-4 the moment a course turns to standing mud, since the knobs keep clearing instead of packing solid the way a shallower tread does."