The 49ers have signed 28-year old DE Justin Smith to a 6-year, $45 million dollar contract.  Smith played in all 16 games last season for the Bengals and he made 78 tackles, defensed 3 passes and he had 2 sacks.  Smith has now played in 111 games in his NFL career and he has made 470 tackles, has 43.5 sacks, defensed 21 passes, forced 7 fumbles and has 2 interceptions.  Don’t expect monster sack numbers from Smith but he’s an excellent defender against the run.  This was a solid move for the 49ers as Smith should improve the defense.