Winter tyres tyre width 225 mm tyre cross section 55 rim diameter 16 inch load index 95 up to 690 kg speed rating h up to 130 mph installation all round tyre rolling resistance f wet grip c noise emission 72 db noise classification nc 2 runflat sipe asymmetrical tread runflat identification ssr csr sst continental rsc bmw run flat technologies ssr self supporting runflat tyre rsc runflat system component erstausrstung bmw