ESPN.com has learned that the 49ers reached agreement with Frank Gore on a four-year contract extension through 2011, with the deal averaging just shy of $7 million in terms of so-called "new money." Gore will receive an initial signing bonus of $6.5 million and total guarantees of nearly $14 million. The contract will pay Gore $13.862 million in its first two seasons and $18.212 million in the first three years. Because Gore had one season remaining on his original rookie contract, the four-year extension creates a five-year deal, and the total value over the course of the five seasons is $28.012 million. Base salaries are $450,000 (for 2007), $2.5 million (2008), $2.5 million (2009), $2.85 million (2010) and $2.9 million (2011). The contract includes a $4.165 million option bonus and roster bonuses of $1.75 million (2009), $1.85 million (2010) and $2 million (2011). Gore's full base salary of $2.5 million in 2009 is guaranteed.