I got back into weight training in April after a long hiatus and since then I have only gained about 15 lbs (I didn't want to bulk and be a fatass through summer). I am now roughly 164 lbs at 5'9" and my biceps are 14" and have been since April. I only do ONE workout specifically for biceps (standing curls).
Also, before my hiatus and when I was on my bulk (probably 2 years ago) I was up to about 177 lbs and my biceps were only 15". Is this genetics that I have super small biceps or am I doing something wrong?