The San Francisco 49ers should get a big boost for their passing game Sunday when they host the St. Louis Rams, as wide receiver Michael Crabtree is set to make his season debut. Crabtree was activated from the physically unable to perform list Tuesday. To make room for him on the roster, the 49ers waived cornerback McLeod Bethel-Thompson. Coach Jim Harbaugh said after the 49ers defeated the Washington Redskins on Monday night that he expects the receiver to play Sunday. Read more http://espn.go.com/nfl/story/_/id/10038857/san-francisco-49ers-activate-michael-crabtree