It's just there for extra water carrying capacity (meant more for touring since it's a touring specific bike). You probably wouldn't use it unless you were touring, or on a long ride when you might need the extra fluids. I have a bottle cage on the underside of my Bike Friday tube. When I carry a bottle there, I just use it to refill the bottle on the top- since it does tend to get a bit dirty.



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My water cage brackets on the seat tube seems awfully close to moving parts - but I think they make water cages where you can pull the bottle from the side so am going to see if I can find that again. The space is only so tight since the bike is so small.

