Profile Design Sonic Ergo 39A Triathlon Extender

If you want to improve your position on your road or triathlon bike, these Profile Design Sonic Ergo 39A aerobars are just what you need (pun intended). Made from aluminium, they are lightweight and easy to adjust. They feature a minimal frontal area to ensure the best possible aerodynamic drag.

By combining these aerobars with the Ergo armrests, every cyclist can optimise their position to achieve the perfect balance between speed and comfort. What’s more, you can switch between a raised position and a lower position depending on your needs.

Technical specifications:

- Colour: Black
- Weight: 564 grams
- Clamp diameter: 31.8 mm (24.0 mm with shims)
- Armrests: Ergo / 10 mm pads
- Armrest width: 124 mm to 290 mm in 18.5 mm increments (with 100 mm extensions)
- Armrest offset: -70 mm to -17.5 mm in 7.5 mm increments
- Armrest stack: minimum 60 mm; the bracket is compatible with our existing risers, which allow for a stack height of 130 mm (70 mm spacers added)
- Construction: 6061-T6 aluminium, pre-drilled for cable routing from the end
- Extension length: 400 mm
- Extension angle: 87 mm (from bottom to top)
- Extension cut-out: total of 15 mm
- Outer diameter: 22.2 mm
- Inner diameter: 19.2 mm
- Electronic or mechanical compatibility