Round profile with micro-siped knobs and carbide studs for traction on ice Works best when run at minimal pressure but can be used at full pressure on non-icy 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 Twin Skin - An additional rubber coating on the side protects against cuts and allows for uniform coloring Studded 700x40 622 Wire Belted Bk/Bsk/Ref 70 970 67 Yes 240UPC/EAN/GTIN: 4026495849876