Profile's RM1 Bottle Cages hold 2 bottles behind the seat where they are tucked out of the wind for superior aerodynamics and easy access, too. There are CO2 pump cartridge mounts as well. The RM1 clamps tightly to standard 7mm-diameter seat rails with the included hardware.
The Aero HC Bracket Kit from Profile Design lets you attach a water bottle and computer mount in between your aero extensions. It fits aero extensions from 85mm to 120mm wide so you can use the bars of your choosing.
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