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    Working closely with Cerv̩lo and their wind tunnel testing results, XLAB developed an aerodynamic single rear system specific to Ritchey clamp seat posts with a 10 mm horizontal rear hole.

    The DELTA SONIC allows the bottle to be close to the saddle, hiding in the rider‰۪s draft and provides clean air flow.åÊThe DELTA SONIC fits snug into the seat post providing a sturdy non-sway bottle mount, for fast and safe access to your bottle. The DELTA SONIC rod can slide along the seat post for the best customized fit for you.åÊ