18''? no way. The Rock has 18'' arms and he's only like 2-3'' shorter than Wallace. I don't think that just because a person is taller, that it makes their arms appear smaller. People say that all of the time, so I tried to disprove it and by having some dude who claimed that he had 19'' arms and was 6'4'', he measured them at 17''. I'd say Ben's arms are no bigger then 16''. anybody else? They just look big because his frame is bigger because being tall he has broad shoulders, and he has probably about 8% body fat.