Winter tyres tyre width 245 mm tyre cross section 45 rim diameter 19 inch load index 102 up to 850 kg speed rating v up to 149 mph installation all round tyre rolling resistance e wet grip e noise emission 68 db noise classification nc 1 rim protector sipe asymmetrical tread runflat identification dsst dunlop rsc bmw run flat technology dsst dunlop self supporting technology rim protection marking fp mfs fr fl fsl ml rpb