Winter 4x4 tyre kennzeichnungen ms snowflake symbol tyre width 255 mm tyre cross section 60 rim diameter 17 inch load index 106 up to 950 kg speed rating s up to 112 mph rim protector rolling resistance f wet grip f noise emission 73 db noise classification nc 2 installation all round tyre sipe unidirectional tread customer benefits equal grip distribution main strength high traction