I beleive Arnold had 21" plus arms when he was filming movies like predator.
Wishful thinking and absurd. He was around 205-210 lb. tops for movies, deliberately slimming down due to the well known belief that movies add 10 more lb. and already being far bigger than anyone else on screen. The idea was to be muscular and athletic. His arms were around 20.5 cold only when 230-250 lb.
I contest shape,just after 76 or 81 O win, Jones measured Franco at 16.5in.
Arnold never had 22in, nor 21in, nor 20in arms, on stage, Arnold's arms were 19in.
Jones had some incentive to fudge the measurements of the Weider boys due to ongoing acrimony with Weider, and both of those are too small. Arnold's arms were always around the same size as Oliva, 20.5 cold close to 22 pumped when in the 230-250 lb. range. Franco around 18-he didn't lose 1.5 inches for a contest.