Winter tyres tyre width 195 mm tyre cross section 55 rim diameter 16 inch load index 91 up to 615 kg speed rating h up to 130 mph installation all round tyre rolling resistance c wet grip b noise emission 72 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