Profile Design Sonic/Ergo/4525a Aerobar — 400mm Extensions, Ergo Armrests, 559g (Black)

The Profile Design Sonic/Ergo/4525a aerobar is a versatile triathlon/time-trial cockpit upgrade offering long 400mm extensions, adjustable angles and lateral shift, plus ergonomic armrests for a wider, more comfortable fit range.

Built as a modern replacement for the popular T3+ AL, the Sonic/Ergo/4525a balances aerodynamics, adjustability and comfort. Its 4525a extensions measure 400mm long with a unique two-angle profile and a subtle lateral shift per side, while Ergo armrests and 10mm pads provide supportive contact points for sustained riding positions. This aerobar is designed for riders who demand finer fit tuning without sacrificing stiffness or low weight.

How do the extension angles and lateral shift change hand position?

The extensions start at a 45° angle then move to a 25° grip section, which creates a natural, ergonomic wrist alignment and varied hand placement. A 7.5mm lateral shift on each side lets you narrow or widen your effective grip without changing the bracket location, aiding precise cockpit setup.

• 400mm extension length for extended reach and aero posture
• Initial 45° ramp then 25° grip for ergonomic alignment
• 7.5mm lateral shift per side for fine width tuning

What does the cockpit fit range cover and how adjustable is it?

The Sonic bracket with Ergo armrests extends the overall fit range to accommodate a wide range of shoulder widths and forearm positions. Widths span from 124mm to 290mm in discrete 18.5mm steps, allowing repeatable adjustments to match your preferred stance or to experiment in pursuit of better aerodynamics and comfort.

• Width options: 124mm–290mm in 18.5mm increments
• Ergo/10mm pads improve forearm support and contact feel
• Bracket type: Sonic for compatibility with common mounting hardware

Will this aerobar fit my bike and what’s included?

The Sonic/Ergo/4525a is compatible with bikes that accept Profile Design Sonic brackets and standard aerobar clamp systems; risers are not included so plan to reuse existing risers or purchase risers separately. The package focuses on extensions and armrest hardware, offering a lightweight, performance-oriented upgrade.

• Included: 400mm 4525a extensions, Sonic bracket-compatible mounting, Ergo armrests with pads
• Not included: risers — measure your current setup for compatibility
• Weight: approximately 559 g in matte black finish

Who is this for: The Profile Design Sonic/Ergo/4525a is aimed at time-trial and triathlon riders who want a broad fit range, precise hand-width tuning and ergonomic arm support for long efforts. It suits riders upgrading from older T3-style bars, athletes who frequently experiment with aero position, and cyclists seeking a lightweight, adjustable cockpit solution without changing frame-mounted risers. If you need integrated extensions, supportive arm cups and the ability to fine-tune width and angle for improved comfort and repeatable setup, this aerobar is a strong candidate.