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Profile Design

Profile Design - Sonic Ergo 45/25a


Product Details



The Sonic/Ergo is designed to present minimal frontal area to create as little aerodynamic drag as possible. The main purpose of an aerobar is, of course, to get the rider into a fast position and, despite a fairly minimalist appearance, the Sonic/Ergo offers a comprehensive fit range for exactly this purpose. 

Fit Data: 
Armrest Offset: -70mm to -2.5mm in 7.5mm steps 
Armrest Width: 124mm to 290mm in 18.5mm steps 
Armrest Stack: 60mm to 70mm in 5mm increments 

Since the Supersonic (J5) was released as a premium bracket with market-leading fit options and versatility, Profile Design wanted to bring similar options to the rest of their range of brackets and aerobars. By simplifying the extension clamp and shifting the wing forward to the bar centreline, they were able to meet their targets. As a consequence of this simplification, the Sonic is the lightest of Profile Design's current brackets. 

The Ergo armrest shares the flippable design of the rest of their new generation armrests. By swapping sides or rotating the armrests smaller increments of movement are achieved – making it simple to fine tune a rider's position or match the position from their previous aerobar or bike.


The 4525a extensions have a first section at 45deg and the grip at 25deg. They also have a 7.5mm lateral shift per side (15mm total) to allow fine tuning of the grip width. They are 400mm and cables exit from end of extension. 

  • Bracket: Sonic
  • Armrest: Ergo / 10mm pads
  • Width: 124mm to 290mm in 18.5mm steps (with Extensions at 100mm) 
  • Offset: -70mm to -2.5mm in 7.5mm steps
  • Stack: The minimum is 60mm and the bracket is compatible with Profile Design's existing risers which add up to 70mm of stack in 5mm increments
  • Weight: 559 grams
Code Description RRP (Inc. GST) Availability
D-RHSNC451 PROFILE SONIC / ERGO / 45/25a AEROBAR $274.90 In stock