A weekly examination of the 49ers' ESPN.com Power Ranking:Preseason ranking: 3 | Last Week: 3 | ESPN.com Power Ranking since 2002The 49ers are tumbling down the rankings. This is what happens when a team is outscored 56-10 in back-to-back weeks.The team is ranked No. 10, two weeks after being No. 1 in the rankings. The 49ers falling down to a double-digit ranking is a bit historic. It is the 49ers' lowest ranking since they were No. 16 in Week 5 of the 2011 season, Jim Harbaugh's first in San Francisco.