Summer tyre tyre width 275 mm tyre cross section 40 rim diameter 18 inch speed rating y up to 186 mph rolling resistance f wet grip b noise emission 72 db noise classification nc 2 runflat rim protector sipes 4 longitudinal grooves asymmetrical tread unidirectional tread listed since 12032014 1452 rim protection marking fp mfs fr fl fsl ml rpb