Winter tyres tyre width 185 mm tyre cross section 65 rim diameter 15 inch load index 92 up to 630 kg speed rating t up to 118 mph installation all round tyre rolling resistance e wet grip c noise emission 71 db noise classification nc 2 sipes symmetrical tread 3d rims directional tread runflat identification rft bridgestone run flat technology rft run flat tyres