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 e noise emission 67 db noise classification nc 1 runflat rim protector sipe asymmetrical tread runflat identification dsst dunlop run flat technology dsst dunlop self supporting technology rim protection marking fp mfs fr fl fsl ml rpb