The 43 ASC (Aero Shaped Carbon) extensions use carbon's ability to be moulded into an aerodynamic form while keeping strength and rigidity. They're made to improve the aerodynamics of the aerobar you already run, and fit any aerobar designed for 22.2 mm extensions.

Highlights

• Aero Shaped Carbon extensions, sold as a left and right pair
• 43° grip angle for a neutral wrist position
• Extension moved sideways to share frontal area with the arm
• Shape refined with CFD for low drag without giving up strength
• 340 mm long, cuts down to 230 mm from the front of the clamp

Shape and grip angle

Profile Design set the grip at 43° to give a neutral wrist position, so you can stay relaxed on the bars. The extension is moved sideways so it shares its frontal area with your arm, and the wrist area is shaped to smooth airflow over the arm and increase contact area for comfort and control. The shape was refined with CFD to reduce drag without giving up strength.

Length and cutting

The 340 mm extensions have a 97 mm rise (bottom to top) and 16 mm total offset. The minimum length is 230 mm, measured from the front of the clamp. They work with electronic or mechanical shifters.

Compatibility & fit

The clamping area is 22.2 mm outer diameter (18.8 mm inner), so the extensions fit any aerobar designed for 22.2 mm extensions. Profile Design says they pair especially well with its Race+ or Ergo+ armrests. A computer mount isn't included: Profile Design pairs the ASC extensions with its ASC Computer Mount, sold separately. Follow Profile Design's 43 ASC Extensions installation instructions.

Aerobar fitting and position set-up is a separate workshop service and isn't included in the price. Our workshop can fit and set up your aerobar.