Winter tyres tyre width 225 mm tyre cross section 55 rim diameter 17 inch load index 97 up to 730 kg speed rating h up to 130 mph installation all round tyre rolling resistance e wet grip c 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