Winter tyres tyre width 185 mm tyre cross section 65 rim diameter 15 inch load index 92 up to 630 kg speed rating h up to 130 mph installation all round tyre rolling resistance c wet grip b noise emission 71 db noise classification nc 2 runflat sipes directional tread symmetrical tread self sealing tyre runflat identification rft bridgestone run flat technology rft run flat tyres