Winter tyres tyre width 225 mm tyre cross section 50 rim diameter 17 inch load index 98 up to 750 kg speed rating v up to 149 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