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Cervélo P-Series UnderCup BTA Mount

from $220.00

The SlipStream 3D UnderCup Between-the-Arms (BTA) Hydration System for the Cervélo P-Series is engineered to position one or two hydration bottles neatly beneath your arm cups, creating a clean, integrated cockpit while keeping hydration easily accessible during training and racing.

Designed specifically for the Cervélo P-Series, the BTA System provides a rigid, secure mounting platform that eliminates bottle movement, even over rough roads. With adjustable stack height and multiple bottle positions, it can be tailored to suit your riding position and hydration preferences.

Whether you're racing a sprint triathlon, 70.3, or Ironman, the SlipStream 3D UnderCup BTA Hydration System provides a stable, aerodynamic solution that keeps hydration within easy reach while maintaining a clean, integrated cockpit.

Cervélo P-Series UnderCup BTA Features

  • Designed for the Cervélo P-Series (Triathlon Bike)
    Purpose-built to integrate seamlessly with the Cervélo P-Series cockpit, delivering a secure, factory-like fit.

  • Dual Bottle Compatible
    Supports one or two standard cycling bottle cages, giving you the flexibility to carry additional hydration for training or racing. All required mounting hardware is included. Bottle cages are sold separately.

  • Aerodynamic Design
    Mounts bottles neatly beneath your forearms to reduce frontal drag while keeping hydration within easy reach.

  • Adjustable Stack Height
    Supplied with three 10 mm spacers, providing up to 30 mm of stack adjustment to fine-tune your cockpit position. Additional spacers are available separately if more height is required.

Every rider's cockpit is unique.

If your setup isn't listed, we can design a custom UnderCup BTA System specifically for your bike. Simply visit our Custom Design page, complete the enquiry form, and we'll work with you to create the perfect solution.

⬇️ See the Additional Information section below for compatibility, sizing and setup instructions.

The SlipStream 3D UnderCup Between-the-Arms (BTA) Hydration System for the Cervélo P-Series is engineered to position one or two hydration bottles neatly beneath your arm cups, creating a clean, integrated cockpit while keeping hydration easily accessible during training and racing.

Designed specifically for the Cervélo P-Series, the BTA System provides a rigid, secure mounting platform that eliminates bottle movement, even over rough roads. With adjustable stack height and multiple bottle positions, it can be tailored to suit your riding position and hydration preferences.

Whether you're racing a sprint triathlon, 70.3, or Ironman, the SlipStream 3D UnderCup BTA Hydration System provides a stable, aerodynamic solution that keeps hydration within easy reach while maintaining a clean, integrated cockpit.

Cervélo P-Series UnderCup BTA Features

  • Designed for the Cervélo P-Series (Triathlon Bike)
    Purpose-built to integrate seamlessly with the Cervélo P-Series cockpit, delivering a secure, factory-like fit.

  • Dual Bottle Compatible
    Supports one or two standard cycling bottle cages, giving you the flexibility to carry additional hydration for training or racing. All required mounting hardware is included. Bottle cages are sold separately.

  • Aerodynamic Design
    Mounts bottles neatly beneath your forearms to reduce frontal drag while keeping hydration within easy reach.

  • Adjustable Stack Height
    Supplied with three 10 mm spacers, providing up to 30 mm of stack adjustment to fine-tune your cockpit position. Additional spacers are available separately if more height is required.

Every rider's cockpit is unique.

If your setup isn't listed, we can design a custom UnderCup BTA System specifically for your bike. Simply visit our Custom Design page, complete the enquiry form, and we'll work with you to create the perfect solution.

⬇️ See the Additional Information section below for compatibility, sizing and setup instructions.

Bar Angle:
BTA Height:

What's Included

  • UnderCup BTA System

  • Stainless hardware

  • 3 × 10 mm spacers

  • Bottle cage hardware

Bottle cages not included.

How to Select Your UnderCup BTA System:

  1. Choose Your Base:
    Select the base that matches your bike setup to ensure compatibility with your arm cups and handlebars.

  2. Choose Your Bar Pitch Range:
    Determine the angle range of your bars (e.g., 11-20 degrees) to ensure proper alignment.

    • Important: When you add this product to your cart, you will be prompted to provide your exact bar pitch measurement for precise customisation.

    • Measure the angle of your bar using the arm cup surface as a reference. Ensure both wheels are on the ground when taking this measurement. If you’re using an iPhone, refer to this guide for help:
      Measure Angles with iPhone

  3. Choose Your Stack Height:

    • Small Stack(Recommended for riders under 5'5" / 165 cm)
      Designed for shorter riders, helping maintain a comfortable and aerodynamic position without excessive arm stack.

    • Medium Stack(Recommended for riders 5'5"–6'0" / 165–183 cm)
      Our standard option, suitable for the majority of riders and offering a balanced fit.

    • Large Stack(Recommended for riders over 6'0" / 183 cm)
      Provides additional elevation for taller riders or those who require a higher front-end position for comfort and fit.

    • Note: These recommendations are a general guide only. Bike fit, flexibility, riding position and cockpit setup all influence the ideal stack height. If you're unsure which option is right for you, feel free to contact us before ordering.

System Details:

  • Dual Bottle Capable:
    Designed to mount up to two standard bottle cages.

    All required mounting hardware is included. Bottle cages are sold separately.

  • Stack Height:
    Adjustable in 10mm increments. The system includes 3 x 10mm spacers, providing up to 30mm of adjustment. Additional spacers can be purchased if you find the system height is too short for your setup.

  • Mounting:
    The UnderCup BTA System mounts securely beneath your arm cups or arm cup wedges, creating a rigid, stable and aerodynamic platform.

  • Materials:
    Manufactured from high-performance engineering polymers and supplied with stainless steel hardware for maximum durability and corrosion resistance.









Bottle Cone Bottle Cone Bottle Cone
Bottle Cone
$65.00

The SlipStream 3D Bottle Cone is an aerodynamic accessory designed to streamline the leading profile of a standard cycling bottle, creating a clean, tapered shape at the front of your hydration setup.

Mounted beneath the bottle cage, the Bottle Cone integrates neatly into your existing setup while also providing a small storage compartment for used gel wrappers, nutrition or other ride essentials.

An optional straw opening allows a hydration bladder straw to pass through the Bottle Cone, making it ideal for custom BTA hydration configurations.

Key Features

Aerodynamic Profile
Creates a smooth, tapered leading profile in front of your bottle for a cleaner, more integrated hydration setup.

Integrated Storage
Features a small internal storage compartment, ideal for gels, used nutrition wrappers or other small ride essentials.

Optional Hydration Straw Opening
Available with an optional opening to route a hydration bladder straw neatly through the Bottle Cone.

Universal Compatibility
Mounts beneath a standard bottle cage, making it suitable for a wide range of compatible BTA and cycling hydration setups.

Simple Installation
Installs directly beneath the bottle cage for a clean and secure fit.

Bottle and bottle cage are not included.

Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount Adjustable Computer Mount
Adjustable Computer Mount
from $75.00

The SlipStream 3D Adjustable Computer Mount provides a clean, highly adjustable way to position your bike computer within your aero cockpit.

Designed to mount beneath a compatible BTA bottle cage setup, the dual-pivot system allows you to fine-tune the height, angle and reach of your computer for improved visibility and a clean, integrated position.

Compatible with Garmin, Wahoo and Bryton computers, the modular design includes interchangeable arms and computer-specific mounting bases to suit a wide range of cockpit configurations.

Key Features

Dual-Pivot Adjustment
Independently adjust the computer angle and forward/rearward position to fine-tune placement.

Interchangeable Arm Lengths
Includes 20 mm, 30 mm and 40 mm arms to adjust height and reach. Longer options are available on request.

Garmin, Wahoo & Bryton Compatible
Available with interchangeable computer mounting bases to suit your preferred cycling computer.

BTA Integration
Mounts neatly beneath a compatible bottle cage for a clean, integrated aero cockpit.

Optional GoPro-Style Accessory Mount
Available with a removable GoPro-style mount for compatible lights, cameras or accessories.

What's Included

  • Mount base

  • 20 mm, 30 mm and 40 mm arms

  • Selected computer mount

  • Mounting hardware

Bike computer, bottle cage, light and other accessories are not included.

Bento Cone – BTA Nutrition Storage Bento Cone – BTA Nutrition Storage Bento Cone – BTA Nutrition Storage Bento Cone – BTA Nutrition Storage
Bento Cone – BTA Nutrition Storage
from $80.00

Keep your nutrition exactly where you need it with the SlipStream 3D Bento Cone—an aerodynamic storage solution designed to mount directly to your Between-the-Arms (BTA) hydration system.

Developed specifically for triathletes and time trial riders, the Bento Cone provides secure, easy-to-access nutrition storage while maintaining a clean, integrated cockpit. Positioned within the airflow between your forearms, it offers a more aerodynamic alternative to traditional top tube bento boxes, keeping your gels within reach without disrupting your riding position.

Whether you're racing a sprint triathlon, 70.3, Ironman or tackling long training rides, the Bento Cone keeps your nutrition organised, protected and ready when you need it.

BTA Bento Cone Sizes

Choose the capacity that best suits your racing and training requirements.

Small

  • Holds approximately 4 Precision Fuel & Hydration PF 30 Gels

  • Ideal for sprint and Olympic-distance racing.

Medium

  • Holds approximately 7 Precision Fuel & Hydration PF 30 Gels

  • Perfect for longer races and most 70.3 events.

Large

  • Holds approximately 10 Precision Fuel & Hydration PF 30 Gels

  • Maximum storage for Ironman racing and long endurance sessions.

Capacities are approximate and based on Precision Fuel & Hydration PF 30 Gels. Capacity may vary depending on the size and shape of other nutrition products.