Summer tyre tyre width 225 mm tyre cross section 40 rim diameter 18 inch speed rating y up to 186 mph rolling resistance e wet grip b noise emission 71 db noise classification nc 2 rim protector sipes 4 longitudinal grooves asymmetrical tread listed since 26052014 1530 rim protection marking fp mfs fr fl fsl ml rpb tyre size required 22540 r18