Winter tyres tyre width 225 mm tyre cross section 45 rim diameter 17 inch load index 91 up to 615 kg speed rating h up to 130 mph installation all round tyre rolling resistance f wet grip e noise emission 72 db noise classification nc 2 runflat sipe asymmetrical tread runflat identification ssr csr sst continental run flat technology ssr self supporting runflat tyre