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XLAB Delta Sonic ML System

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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

XLAB's Delta Sonic is a behind-the-saddle single bottle cage mount designed for seatposts with a 10mm horizontal rear hole. Attached to the Delta Sonic is the three-finger Gorilla cage, clamping down with 7 pounds of grip. This hydration system allows the bottle to sit close to the saddle, hiding in the rider’s draft without adding on drag.

XLAB has found the following bikes to be compatible with the Delta Sonic: Cervelo P5 and 2013 P3, Scott Plasma, Kestrel 4000, Fuji D6 and Norcom, and BH Aero.


  • Specific to Ritchey clamp seat posts with 10mm horizontal rear hole.
  • XLAB recommends 1" insertion minimum into seatpost.
  • Included: Delta Sonic Rod, Gorilla Cage, hardware & installation instructions.
  • Material: Stainless Steel (rod); Carbon Fiber (cage).
  • Weight: 151g.

Cage Material: Carbon Fiber 

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*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Sat). Orders over $50 are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details.