Preseason Week 1 grades: The offense
SAN FRANCISCO – Here are my preseason Week One grades for the Niners’ offense. Offensive line: A. In the running game, they completely pushed the Vikings’ defensive line around. The 49ers averaged 6.3 yards per rush because the offensive line created gaping holes all night. Rock Cartwright gained 44 yards on 8 carries. When was the last time you saw Cartwright do that? In pass protection, the offensive line looked…