Originally Posted by
deapee
According to Trek's website, 74" (6'2") would put you at the upper end of the 58 or the lower end of the next size up. You're fine on the 58.
He's most likely just about perfect on the 58cm then. Given that he's having trouble with the seatpost being too short that would imply longer than average legs, and therefore a shorter torso, leading to needing a frame toward the smaller end of recommended.