With the holidays approaching, many of you might be putting “New Fly Rod!” on your lists of potential gifts. But this raises the question: What size fly rod do you want/need? As I explain in the above video, this question is really more about the line than it is about the rod. The species of fish you want to chase will determine the kinds of flies you want to throw. If you want to cast size 2 streamers, you’ll need a heavier line (and thus a heavier rod) than you would need for casting dry flies to brook trout.