When he came into the league he was, I thought, considered 6'10".
Draft express has a profile of him as a prospect and listed him at 6'10.25" in shoes. (by the way, he has an impressive 7'4.5" wingspan, which obviously helps a lot)
I've had multiple people tell me they thought he grew since coming into the league and that he's now 7' tall.
NBA.com has him at 6'11".
Kareem just tweeted this photo of the two of them together. Keep in mind that Abdul-Jabbar, like Roy Hibbert, is 7'2" tall.
So, I'm saying he's maximum 6'11", but he still could be 6'10" based on what I think I'm seeing here.
What do you think?