Winter 4x4 tyre kennzeichnungen ms snowflake symbol tyre width 285 mm tyre cross section 60 rim diameter 18 inch load index 116 up to 1250 kg speed rating r up to 106 mph rim protector rolling resistance e wet grip f noise emission 75 db noise classification nc 2 installation all round tyre sipe unidirectional tread customer benefits equal grip distribution main strength high traction