SWB MARATHON WINTER PLUS 700x35 PERF TWIN SM-GUARD BK/BK/REF 240-STUD-SNOW WIRERound 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 SGRD Smartguard equipped tires feature a 5mm breaker belt made from special Indian and partially recycled rubber TWN An additional