Winter tyres tyre width 225 mm tyre cross section 50 rim diameter 17 inch load index 94 up to 670 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 identification moe mercedes rft bridgestone run flat technologies moe mercedes benz original tyres with emergency running properties rft run flat tyres