LOS ANGELES — While Toby Gerhart rampaged through the Southern California defense in an awfully quiet Coliseum, the star tailback and his Cardinal teammates flattened a bunch of recent college football certainties as well.

USC's streaks of seven straight BCS bowls, 11-win seasons and top-four AP poll finishes? Those are all finished.

The Trojans' Pac-10 dominance over the past seven years? It's all but over after Stanford paved the way for a new West Coast champion.

Gerhart took time on the Coliseum field to savor the moment after rushing for 178 yards and three touchdowns in No. 25 Stanford's 55-21 victory yesterday over the 11th-ranked Trojans, who allowed the most points in school history.

"To do that against a storied program, a perennial power, it's the greatest feeling in the world," said Gerhart, the Pac-10 rushing leader. "It was just will. The offensive line just moved people. We got after them and got downhill, and it was just a good offensive day."

How good? The loss was the Trojans' worst since a 51-0 defeat at home against Notre Dame in 1966. Coach Pete Carroll lost in November for the first time at USC after 28 straight victories.

Andrew Luck threw two touchdown passes and ran for another score for the Cardinal (7-3, 6-2 Pac-10), who followed up their surprising rout of Oregon last week with a strong start and a big finish at the Coliseum.

The Trojans (7-3, 4-3) haven't lost to any other opponent at home since 2001, going 47-2.