In this position, unlike quarterback, depth is a major, major factor in these rankings.
1. Texas A&M
The Aggies had the two most talented backs, and despite injuries to both, proved it through an otherwise frustrating 2011. Christine Michael suffered a torn ACL, but still managed 899 yards on just 149 carries. Cyrus Gray injured his shoulder late in the season, but secured his second consecutive 1,000-yard season and ranked third in the Big 12, despite carrying the ball just 198 times. This duo should have easily surpassed 1,000 yards, but even when they were injured, Ben Malena played well in the final two games.
Christine Michael averaged 6 yards per carry before a torn ACL ended his season.
Mizzou dealt with injuries, too, first to Kendial Lawrence and De'Vion Moore. Cue Henry Josey. Josey became the best back in the Big 12 this year before suffering a major knee injury that included torn ligaments. He may not be back in 2012. His 1,168 yards were third most in the Big 12, despite carrying the ball just 145 times. Lawrence finished 12th with 566 yards.
3. Oklahoma State
Joseph Randle stole the show this year, rushing for 24 scores and ranking second in the Big 12 with 1,216 yards. Only Collin Klein ran for more touchdowns and Terrance Ganaway was the only player with more yardage. Still, Jeremy Smith had averaged more than 7 yards a carry, and he'd be able to start for anyone else in the league. Herschel Sims showed promise, too, with 242 yards on 31 carries.
Ganaway led the Big 12 in rushing with huge performances late in the season, including a 200-yard, five-touchdown game in his final outing as a college athlete in the Alamo Bowl. He averaged more than 6 yards on his 250 carries and had 330 more yards than any other back in the league. Jarred Salubi added 331 yards, too.
Texas' Malcolm Brown and Joe Bergeron were banged-up late in the season, but Fozzy Whittaker played well until suffering a torn ACL against Missouri, too. Scatback D.J. Monroe was effective in the passing game as well. Four running backs topped 300 yards and Brown led the team with 742 yards, despite missing three games and having his carries limited early in the season.
Oklahoma got great contributions from walk-on Dominique Whaley early on, and he proved to be the team's most effective runner and best runner between the tackles. He fractured his ankle in midseason, and finished with just 627 yards to lead the team. Roy Finch emerged late in the seasons after a quiet first half and added 605 yards.
KU's James Sims led the team in rushing again with 727 yards. Darrian Miller was excellent, too, with 559 yards, though he was dismissed after the season. Freshmen Tony Pierson and Brandon Bourbon have plenty of promise, both averaging more than 5.5 yards a carry in 2011. The bad news: All their carries were limited by an awful defense that limited KU's chances to run the ball.
8. Kansas State
K-State's rushing attack centered around Klein, but John Hubert, a slippery back from Waco, Texas, had a good year. Hubert was seventh in the Big 12 with 970 yards. Bryce Brown offered basically nothing to K-State, and beyond Klein and Hubert, the Wildcats were pretty thin. Additionally, without Klein, would Hubert have duplicated his success?
9. Texas Tech
An awful knee injury derailed Eric Stephens' likely 1,000-yard season, and the rest of Texas Tech's backfield got banged-up, too. Stephens will probably return in 2012 from his dislocated knee, and finished with 565 yards, 17th in the Big 12. Aaron Crawford and DeAndre Washington both topped 300 yards.
10. Iowa State
ISU lost Shontrelle Johnson for the season early on, but James White filled in well. He finished with 743 yards, which ranked ninth in the Big 12. Jeff Woody had 380 yards and provided quality carries late, including the game-winning touchdown against Oklahoma State.