Round profile with micro-siped knobs and carbide studs for traction on ice The spikes work best on ice when running at minimum pressure, while at maximum pressure the tires can be ridden on ice-free roads with minimal road noise *To ensure proper spike seating the tire should be run for roughly 25 miles on asphalt while avoiding fast acceleration or hard braking Smartguard puncture protection is Schwalbe`s top line of defense and features a 5mm rubber breaker Twin Skin - An additional rubber coating on the side protects against cuts and allows for uniform coloring