Summer tyre tyre width 225 mm tyre cross section 40 rim diameter 19 inch speed rating y up to 186 mph rolling resistance c wet grip b noise emission 68 db noise classification nc 1 runflat rim protector sipe asymmetrical tread self sealing tyre listed since 16122016 1308 rim protection marking fp mfs fr fl fsl ml rpb tyre size required 22540 r18 erstausrstung mercedes