Starters: Kelvin Beachum (LT) and Marcus Gilbert (RT)
Third offensive tackle: Mike Adams
New assistant coach Mike Munchak will take control of the offensive line this year, so it should be interesting to watch him manage the situation at tackle.
Last season, Kelvin Beachum asserted himself once given the opportunity to start at left tackle. He may not have been dominant, but he was more than serviceable and is the incumbent heading into the 2013 season.
Marcus Gilbert grabbed the right tackle spot and is the favorite to maintain this position. He is an effective starter, but there is potential for Mike Adams to win the job.
Adams has a ton of potential, particularly in run blocking. When he locks onto a defender, he can dominate with this strength and open up holes—particularly from the right side of the line. However, he struggles against speed-rushers and has been a liability in pass protection.
Though there may be talent at the tackle position, it has yet to be maximized, and none of the aforementioned players should be considered locks for the starting lineup. In fact, the Steelers may provide Munchak with the opportunity to coach one of the more highly touted linemen in this year's draft class:
It is possible that Lewan is available when the Steelers are on the clock in the first round. If he checks out, he becomes a realistic option to not only be the pick, but also a rookie starter.