Profile Design Sonic aerobars are clip-on extensions built around the Sonic bracket, designed to present as little frontal area as possible while still offering a wide fit range. They suit time triallists and triathletes, and anyone adding an aero position to an existing road bike.

The point of an aerobar is position, and position is personal, so adjustability matters more than the bar itself. The Sonic bracket adjusts easily for stack and reach and pairs with the Ergo armrest, while extension length and rotation set from a single top bolt. Profile Design's aluminium extensions come in several grip angles, so you can choose a shrugged high hold or a more open head-up position depending on how you ride.

Key features

• Sonic bracket with an extensive fit range and minimal frontal area
• Ergo armrests
• Aluminium extensions available in several grip angles
• Extension length and rotation adjust from a single top bolt
• Clip-on fitting to a standard road bar

An aero position you cannot hold is slower than a normal one you can. Get a fit done before you commit to an extension angle, because a bar cannot fix a position that does not work for your body.