Winter tyres tyre width 195 mm tyre cross section 55 rim diameter 17 inch load index 92 up to 630 kg speed rating h up to 130 mph installation all round tyre rolling resistance e wet grip b noise emission 72 db noise classification nc 2 runflat sipe directional tread runflat identification rf zp pirelli rsc bmw run flat technologies zp zero pressure rsc runflat system component rim protection marking fp mfs fr fl fsl ml