A tread for a tire for a heavy-duty vehicle for mixed use and aims to improve the endurance of the crown of the tire following retention of stones in the tread. The tread () has voids () with a first, radially outer void portion () of groove type, having a width W on the tread surface (), a width W at a groove bottom (), and a depth H, and a second, radially inner void portion () of sipe type, having a width W and a depth H and leading into the groove bottom () at a distance E with respect to the mean surface (S) of the groove (). The distance E is at least equal to the width W of the groove bottom () divided by 6.
