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 a noise emission 70 db noise classification nc 2 rim protector sipe asymmetrical tread listed since 18032010 1452 rim protection marking fp mfs fr fl fsl ml rpb tyre size required 22540 r18 erstausrstung mercedes