I have contemplated that age old question (well, since 2011 when I got my Tiger). At first I thought I had to have one to complete the look of the bike. A plus was it would annoy some BMW GS owners. But that wasn't a good enough reason. If the beak did something other than cosmetic (flying mud not a problem for my Roadie). Maybe if it directed more air to the radiator or air away from me I could justify it. Hopefully this animated GIF will help others (I hope it animates!). Otherwise you will see two separate images. My opinion: The beak completes the lines or flow of the tank. But I would have to paint the front fender black so the beak wouldn't look redundant. Thanks to the person that posted a picture of his bike so I could play with it.