Winter tyres tyre width 245 mm tyre cross section 50 rim diameter 18 inch load index 100 up to 800 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 rim protector sipe asymmetrical tread runflat identification ssr csr sst continental run flat technology ssr self supporting runflat tyre rim protection marking fp mfs fr fl fsl ml