Niners finish preseason 2-2.

Michael Robinson is making a smooth transition to running back.

Robinson ran for two touchdowns in the second quarter to help the San Francisco 49ers end the preseason with a 23-14 victory over a San Diego Chargers team still searching for a backup quarterback.

Robinson was the Big Ten offensive player of the year in 2005 after quarterbacking Penn State to the conference title. Attracted by his athleticism and versatility, the 49ers picked him in the fourth round and immediately turned him into a running back.

With starter Frank Gore getting a rest to avoid possible injury, Robinson got his most extensive action of the preseason and delivered on the opportunity. He carried 12 times for 59 yards, scoring on runs of 1 and 13 yards in the second quarter.

Robinson was the offensive star for the 49ers, who made it into the end zone only once in each of the past two preseason games. Quarterback Alex Smith played only three series, completing one of four passes for 11 yards.

[Full Gameday]