Profile Design 39a Aerobar Extensions | 400 mm

The 39a aluminum extensions are the next-generation aero bar add-ons inspired by the successful T-Series line. With a 26° bend, these extensions offer both comfort and versatility, giving riders the ability to dial in their hand position for better ergonomics and riding efficiency. Suitable for both beginners and experienced athletes, the 26a provides an ideal balance of performance and comfort.

Key Features:

• 39° Angle: Supports both “shrugged” and “head-up” hand positions depending on riding style and preference.
• 7.5 mm Lateral Offset: Allows subtle width adjustment of hand position without needing to over-rotate the extensions—avoids shifter interference.
• Aerodynamic Kamm Tail Profile: Designed to reduce drag through the angled extension shape.
• Ergonomic End Caps: Provide improved grip and comfort over long distances.
• Compatibility:
  • Clamp zone diameter: 22.2 mm – fits most aerobar systems.
  • Cable routing: Rear exit only, with no front port—ideal for both electronic and mechanical drivetrains.

Technical Specifications:

• Construction: 6061-T6 aluminum, pre-drilled for bar-end shifter cable routing
• Extension Length: 400 mm
• Extension Angle: 39 Degrees
• Extension Rise: 87 mm (bottom to top)
• Extension Offset: 15 mm total
• Outer Diameter: 22.2 mm
• Inner Diameter: 19.2 mm
• Shifter Compatibility: Electronic or Mechanical
• Includes: Sold as a pair (1 right and 1 left extension)
• Color: Anodized Matte Black
• Weight: 204 g/pair
• Min Length: mm (from the front of clamp)