Summer tyre tyre width 225 mm tyre cross section 40 rim diameter 18 inch speed rating y up to 186 mph rolling resistance f wet grip a noise emission 72 db noise classification nc 2 rim protector sipes asymmetrical tread 4 longitudinal grooves listed since 11072006 1752 rim protection marking fp mfs fr fl fsl ml rpb tyre size required 22540 r18