Winter tyres tyre width 225 mm tyre cross section 45 rim diameter 17 inch load index 91 up to 615 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 moe mercedes run flat technologies ssr self supporting runflat tyre moe mercedes benz original tyres with emergency running properties