Summer tyre tyre width 225 mm tyre cross section 40 rim diameter 18 inch speed ratings y up to 186 mph zr over 150 mph rolling resistance g wet grip c noise emission 70 db noise classification nc 2 rim protector sipe asymmetrical tread listed since 11072006 1728 rim protection marking fp mfs fr fl fsl ml rpb tyre size required 22540 r18 erstausrstung porsche