The Zipp Vuka Extensions are a component designed to enhance the rider's position and aerodynamics on a bicycle. These extensions are compatible with handlebars and clip-on systems that accommodate a 22.2 mm diameter, which is an industry standard.
Function Description:
The primary function of the Vuka Extensions is to provide an extended reach for the rider, allowing for a more aerodynamic and comfortable riding position, particularly in time trials or triathlon events. They are designed to integrate with existing handlebar setups, offering a platform for the rider's forearms and hands. The extensions can be shortened to suit individual preferences and ergonomic requirements, enabling a personalized fit. They also support the installation of TT shifters, allowing for convenient gear changes from the extended position.
Important Technical Specifications:
- Diameter: The Vuka Extensions feature an industry-standard 22.2 mm diameter, making them compatible with TT shifters and Zipp Vuka products that use 22.2 mm clamps.
- Material: The manual indicates two types of extensions: Aluminum and Carbon. The Carbon Extensions require the use of Zipp Carbon Assembly Paste on clamp contact surfaces to ensure proper installation and prevent slippage.
- Minimum Protrusion: When installed, the extensions must protrude a minimum of 5 mm behind the clamp to ensure secure fitting and proper function.
- Cutting: Both Aluminum and Carbon extensions can be shortened. For Carbon Extensions, a saw guide and a 28-tooth (minimum) blade saw are required for cutting. After cutting, the area should be smoothed with 400 grit sandpaper and cleaned with isopropyl alcohol. For Aluminum Extensions, a hacksaw and a file are recommended for shortening.
Usage Features:
- Customizable Length: The extensions can be cut to the desired length, allowing riders to fine-tune their position for optimal comfort and aerodynamics. The manual provides clear instructions for marking and cutting, emphasizing the importance of measuring twice and cutting once.
- Shifter Integration: The extensions are designed to accommodate TT shifters. The shifter cable housing is inserted through a port on the underside of the extension, and the end plug is secured in the rear of the extension or with a cinch clip. The manual details the installation process for both mechanical and eTap® shifters, including the use of a bezel for eTap® Carbon EVO extensions.
- Secure Installation: The use of Zipp Carbon Assembly Paste (for carbon extensions) on clamp contact surfaces is crucial for preventing slippage and ensuring a secure fit. Riders are advised to consult their handlebar or clip manufacturer's instructions for specific installation guidelines.
- Cable Routing: The design allows for internal cable routing, contributing to a cleaner aesthetic and improved aerodynamics.
Maintenance Features:
- Cleaning: Vuka Extensions should be cleaned using only water and mild soap.
- Routine Inspection: Regular inspection is recommended to check for signs of damage or fatigue. This includes looking for cracks, dents, deformation, discoloration, scratches, or audible creaking.
- Replacement: Any damaged or fatigued parts should be discontinued from use and replaced immediately.
- Professional Consultation: Riders are advised to consult a Zipp dealer for assistance in determining an appropriate replacement schedule based on their usage and the condition of the extensions. This ensures the ongoing safety and performance of the component.
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