Winter tyres tyre width 225 mm tyre cross section 40 rim diameter 18 inch load index 95 up to 690 kg speed rating v up to 149 mph installation all round tyre runflat rim protector sipe asymmetrical tread runflat identification moe mercedes rft bridgestone run flat technologies moe mercedes benz original tyres with emergency running properties rft run flat tyres rim protection marking fp mfs fr fl fsl ml rpb