Winter tyres tyre width 215 mm tyre cross section 45 rim diameter 17 inch load index 91 up to 615 kg speed rating v up to 149 mph installation all round tyre rolling resistance c wet grip b noise emission 69 db noise classification nc 1 rim protector sipes symmetrical tread directional tread runflat identification dsst dunlop run flat technology dsst dunlop self supporting technology rim protection marking fp mfs fr fl fsl ml r