Sorry, this product is no longer available!
XLab Delta Sonic XL Rear Mount System is no longer available at Merlin Cycles. However you may find an alternative or updated product below.

This item was discontinued 13th November 2018.

If you require help finding an alternative to this product please contact customer services.

Code: 2029-XL
XLab Delta Sonic XL Rear Mount System
  • The only single bottle carrier compatible with 10mm horizontal hole seatposts!
  • Ideal for rear-ward saddle positions or long backed saddles. 0.8" longer than standard Delta Sonic.
  • Strong and sturdy mount eliminates rear carrier sway.
  • Gorilla XT Cage has a tight 14lb grip on bottles eliminating unexpected launches.
  • Carry your repair with the optional Multi-Strike Repair Holder.
  • The Delta Sonic Xl allows for a rear seat position and is 0.8" longer than the standard Delta Sonic.
  • Working closely with Cervélo 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.


Aerodynamic Design

  • The Delta Sonic Xl allows the bottle to be close to the saddle, hiding in the rider’s draft and provides clean air flow.

Reliable & Customizable

  • The Delta Sonic Xl fits snug into the seat post providing a sturdy non-sway bottle mount, for fast and safe access to your bottle. The Delta Sonic XL rod can slide along the seat post for the best customized fit for you. XLab recommends a 1" insertion minimum into the seatpost.


  • XLab has found these bikes to be compatible with the Delta Sonic XL.
  • Cervelo P5 & 2013 P3, Scott Plasma, Kestrel 4000, Fuji D6 & Norcom, BH Aero.


  • Delta Sonic XL Rod.
  • Gorilla XT Cage.
  • All hardware and installation instructions.


  • Rod: Stainless Steel.
  • Cage: Carbon Fibre.


  • Rod 107 grams, Cage 49 grams. Total 156 grams.


  • Rod: 3 Year Warranty.
  • Cage: Lifetime Warranty.