How do you set up a rider with a big ape factor – arms that are significantly longer (greater than 4cm) than their torso? The arms need to reside somewhere on the bike but is it out, down, or both? In most cases this indicates a need for a deeper drop to the bars. Commonly the rider presents with a long reach.
A long reach over-extends the upper body joint angles, placing more weight on the hands, and tension back up the kinetic chain into the shoulders. If a rider with relatively long arms complains of hand numbness and shoulder tension, these are indicators to investigate a shorter reach and deeper drop to the bars. Fitting a rider recently like this resulted in an immediate exclamation of relief as weight was relieved from his hands and his shoulders relaxed down.