Standard frame-mounted bottles have high aerodynamic drag, so place your bottle at the rear instead. The Delta 100 mounts on the saddle rails for no measurable drag. This great-value carrier includes Xlab's nylon-composite P-Cage which provides a 5-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.