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 c wet grip a noise emission 71 db noise classification nc 2 rim protector sipe asymmetrical tread listed since 12022016 0916 rim protection marking fp mfs fr fl fsl ml rpb tyre size required 22540 r18