49ers' James complains about lack of work

San Francisco 49ers running back LaMichael James used Twitter this week to vent his frustration over playing time this season.

With Frank Gore entrenched as the starter and Kendall Hunter as his backup, James was inactive for the 49ers' first three games. He had three carries for zero yards against the St. Louis Rams in Week 4.

"Some things I just don't understand at all I don't work at State Farm I'm not trying to be insurance," James said on Twitter.

He later deleted the tweet but added, "I don't tweet bout football on anything to my team so don't need ur input."

James, 23, played in four regular-season games last season and had 125 yards rushing on 27 carries and three receptions for 29 yards.