Summer tyre tyre width 225 mm tyre cross section 40 rim diameter 18 inch speed rating w up to 168 mph rolling resistance c wet grip a noise emission 72 db noise classification nc 2 rim protector sipes asymmetrical tread 4 longitudinal grooves listed since 17072014 0606 rim protection marking fp mfs fr fl fsl ml rpb tyre size required 22540 r18