Winter 4x4 tyre kennzeichnungen ms snowflake symbol tyre width 275 mm tyre cross section 60 rim diameter 18 inch load index 113 up to 1150 kg speed rating r up to 106 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