bottle holders and other attachments

Choosing the right bottle holder for a triathlon bike is often a detail that fades into the background in addition to wheels, handlebar attachments and the frame itself. Aerodynamics can be significantly influenced at this point in particular. Athletes who want to optimize every second on the track should therefore also pay attention to the shape and placement of their water bottle holders.

‍

Aerodynamic aspects of choosing bottle holders

A conventional, inconspicuous bottle holder may serve its purpose, but it can unnecessarily increase air resistance. When choosing aerodynamic bottle holders, the following factors play a role:

• Form and material: Flat, streamlined profiles and materials that offer a smooth surface minimize turbulence and thus reduce air resistance. Some manufacturers offer specially shaped holders, which should fit more seamlessly into the design of the frame.
• Positioning on the frame: Depending on the frame geometry and bottle shape, the classic position on the lower or seat tube can be more or less aerodynamic. The aim here is to find a position in which the bottle is affected as little as possible by the airflow.
• Number of bottle holders: Each additional attachment potentially increases air resistance. Athletes should therefore carefully consider how many water bottles they need during the competition and avoid unnecessary storage.

‍

The benefits of Between-The-Arms (BTA) holders

A particularly aerodynamically advantageous position for water bottle holders is the installation between the handlebar attachment (BTA) armrests. There are several benefits to this position:

• Reduced forehead resistance: The bottle is in the wake of the athlete's arms, which reduces frontal air resistance.
• Less impact on airflow: Compared to mounting on the frame, a BTA bottle is less likely to interfere with airflow around the leg.
• Ergonomic advantage: In this position, the water bottle is easily accessible without having to leave the aerodynamic position.

However, the use of BTA holders requires a compatible handlebar attachment and, if necessary, special bottles and holders that can be seamlessly integrated into the system. In addition, after somewhat absurd excesses in the past, the options for installing bottles here have been restricted by the regulations of the German Triathlon Union, IRONMAN and other organizers. Appropriate regulations should therefore be considered before the start.

‍

Aerodynamic bottle holders and their effects on speed

There is no general answer to the question of whether aerodynamic bottle holders actually provide a measurable speed advantage. The actual profit depends on various factors, including the speed traveled, wind conditions and the athlete's individual aerodynamics.

Nevertheless, wind tunnel tests and practical experience show that aerodynamically optimized bottle holders and in particular BTA systems can have a positive effect on air resistance. This advantage may seem small in detail, but it adds up over the distance of a triathlon and can save decisive seconds.

‍

Other attachments to improve aerodynamics on triathlon bikes

In addition to aerodynamic bottle holders, there are a number of other attachments that can improve the aerodynamics of a triathlon bike:

• Aero handlebars and attachments: They allow a more streamlined posture.
• Aero wheels: High-profile rims or disc wheels significantly reduce air resistance.
• Aerodynamic frame shapes: Specially designed frame profiles are optimised for low air resistance.
• Special triathlon saddles: Some models are narrower and allow a more aggressive sitting position.
• Integrated storage systems: Top tube or frame boxes can be designed to interfere with airflow less than traditional bags.

The selection of the “best” attachments depends on the budget, individual needs and the specific requirements of the competition. It is advisable to obtain comprehensive information and, if necessary, seek professional advice to find the optimal components for your own setup.

‍

Conclusion: Every detail counts for maximum aerodynamics

Even though bottle holders seem inconspicuous at first glance, they play a role in the aerodynamic optimization of a triathlon bike. Athletes who want to fully exploit their potential should therefore not only pay attention to the large components, but should also include details such as the shape and placement of their bottle holders in their considerations. BTA systems in particular offer significant aerodynamic potential here and should be considered when putting together the perfect triathlon setup.