Shop BTA Systems
Between-the-Arms (BTA) Systems
SlipStream 3D BTA Systems are built for triathlon and time trial riders seeking a cleaner, more secure between-the-arms hydration setup. Our range includes UnderCup mounts, dual bottle systems, cockpit-specific options, riser kits and custom fits for bikes from Cervelo, Giant, Trek, Canyon, Cube, Liv, Sync Ergonomics and Profile Design.
BTA systems keep hydration accessible while maintaining an aero cockpit. Each mount focuses on fit, stability and adjustability, with features like bar angle selection, stack height adjustment, multiple bottle positions and light mount integration. If your cockpit isn’t listed, use the Custom UnderCup BTA Form and we’ll create a solution tailored to your bike
BTA Accessories
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.
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.
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.
Custom BTA
Custom BTA
Not seeing an option that fits your specific setup?
Use the Custom UnderCup BTA Form to send through your measurements, photos and setup details. We’ll review your cockpit and help create a BTA mounting solution matched to your bike, bar angle, stack height and hydration needs at no extra cost!
From $215