3.1.7. The inscription "ET" and/or "POR" if the tyre is classified in the category of use "Special use". In addition, they may also bear the inscription M+S or M.S or M&S.
ET means Extra Tread and POR means Professional Off Road. 		a5c0
3.1.7. The inscription "ET" and/or "POR" if the tyre is classified in the category of use "Special use".
ET means Extra Tread and POR means Professional Off Road 		a4c0
3.1.6. The inscription "ET" and/or "POR" if the tyre is classified in the category of use "Special use".
ET means Extra Tread and POR means Professional Off Road 		a3c0