Niners QB Alex Smith inactive vs. Rams

Quarterback Alex Smith is inactive for the San Francisco 49ers’

game against St. Louis.

Troy Smith is making his second straight start Sunday for the

49ers, who dressed just two quarterbacks to face the Rams.

Alex Smith separated his left shoulder during the 49ers’ loss to

the Carolina Panthers last month. The former No. 1 draft pick

didn’t participate in much of last week’s practices following San

Francisco’s bye week.

David Carr will back up Troy Smith, who capped his first start

for the 49ers by leading a late rally in a win over Denver two

weeks ago in London.