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BMC Speedmachine UnderCup BTA Hydration System

from $220.00

The SlipStream 3D UnderCup Between-the-Arms (BTA) Hydration System for the BMC Speedmachine 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 BMC Speedmachine, 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.

BMC Speedmachine UnderCup BTA Features

  • Designed for the BMC Speedmachine (Triathlon Bike)
    Purpose-built to integrate seamlessly with the BMC Speedmachine 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 BMC Speedmachine 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 BMC Speedmachine, 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.

BMC Speedmachine UnderCup BTA Features

  • Designed for the BMC Speedmachine (Triathlon Bike)
    Purpose-built to integrate seamlessly with the BMC Speedmachine 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 Bar Pitch Range

Select the bar pitch range that best matches your aero extensions (e.g., 11–20 degrees) to ensure proper alignment of the system.

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

  • Measure the angle of your bars 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 the Measure Angles with iPhone guide for assistance. Measure Angles with iPhone

2. 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 10 mm increments. The system includes 3 × 10 mm spacers, providing up to 30 mm of adjustment. Additional spacers can be purchased if more height is required.

  • 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 durability and corrosion resistance.

  • Custom Setups

    If your BMC Speedmachine cockpit, arm cup spacing or bar angle differs from the listed options, use the Custom UnderCup BTA Form and we can help create a system matched to your exact setup.





Bottle Cone Bottle Cone
Bottle Cone
$45.00

The Bottle Cone is an aerodynamic solution designed to streamline the profile of a standard bottle, reducing drag and enhancing performance. This accessory creates a sleek, tapered shape at the front of the bottle, improving airflow and efficiency during rides.


Key Features

  • Aerodynamic Design: Optimises airflow by shaping a standard bottle into an aerodynamic profile.

  • Universal Compatibility: Mounts securely underneath the bottle cage, making it compatible with most cycling setups.

  • Easy Installation: Simple and secure mounting process ensures a quick upgrade to your setup.

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 is built for ultimate flexibility and aerodynamic integration. Designed to sit neatly under your BTA bottle cage, this system gives you full control over your bike computer’s height, angle, and reach.

Compatible with Garmin, Wahoo, and Bryton computers, the mount uses a modular system that adapts to your setup.

Key Features:

  • Interchangeable Arms (20mm, 30mm, 40mm): Dial in your ideal computer height and forward offset. Longer arms available on request.

  • Dual Pivot System: One hinge adjusts the angle of the computer, the second adjusts the forward/backward offset to bring the computer closer or further from your arms.

  • Modular Mount Base: Swappable computer bases for different brands including Garmin, Wahoo, and Bryton (specify when ordering).

  • Mounts Under Bottle Cage: Clean integration under your BTA hydration setup.

  • Removable GoPro-Style Light Mount: Add a rear-facing light for increased visibility—compatible with most GoPro-style lights and Varia mounts.

Included:

  • Mount Base

  • Three Arm Lengths: 20mm, 30mm, and 40mm

  • Computer Mount

  • Mounting Hardware

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.