Standard frame-mounted bottles have high aerodynamic drag, so place your bottle at the rear instead. The Delta 200 mounts on the saddle rails for no measurable drag. Our most popular single rear carrier includes Xlab's Gorilla XT carbon cage which provides a tight 14-pound grip on your bottle. It mounts to most standard metal-rail saddles (for carbon rails, purchase the optional Delta Adapter). For a complete system, purchase the optional X-Strike Inflation Kit and store up to 4 CO2 cartridges.