Profile Design - Sonic Ergo 43a Wrist Relief

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Stock Item:
In stock! Usually ships same day to main cities around NZ. Please note Bikes can take up to 2-5 days for delivery.


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

The extension length and rotation can be easily adjusted using the top bolt. There are 100 distinct position options achievable just by moving the armrests. Combine that with the risers and this bar offers 1500 possible configurations. As a clip-on bar it is also possible to adjust the extension width and tilt easily. According to Profile Design, this is the most adjustable clip-on bar on the market (and in history).

Since the Supersonic (J5) was released as a premium bracket with market-leading fit options and versatility, Profile Design wanted to bring the 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 we were able to meet these targets. As a consequence of the simplification, the Sonic is the lightest of Profile Design's current brackets.

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


The 43a extension offers a "wrist relief" style bend that is intended to allow the extension to hug to the arm for improved aerodynamics without sacrificing wrist comfort.

  • 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
Shipping Information

Our on-line store is open 24/7 and we ship Monday through Friday, excluding some holidays. Orders received for products without shipping restrictions on its product page will ship the same business day when received before 12:00 p.m.

About Us

Since 1938, Papanui Cycles has been serving the North West of Christchurch and after 80 years they are still offering great service.

Now established as one of Christchurch’s largest suburban cycle shops.

Offering top Global selling brands such as Merida, Marin, Apollo.

‚ÄúService is our number one goal,‚ÄĚ says Kevin. ‚ÄúEveryone who works here is fully trained in sales along with mechanical and product knowledge, when it comes to cycles, we know our stuff.‚ÄĚ

Everything from reliable commuting bikes to full suspension mountain bikes and carbon road bikes,

‚ÄúWith all Cycles we sell, not only do we give a manufacturer‚Äôs warranty, but exclusive too Papanui Cycles, we offer one Free General Service, valued at $93.00 after 2 months from date of purchase.‚ÄĚ

Papanui Cycles has all your cycling needs and is looking forward to seeing you in store soon‚Äč‚Äč‚Äč.‚Äč‚Äč‚Äč

Contact us

You can contact us here! Please see the notes below before making an enquiry. 

  • If you have a query about your order please¬†login to your account¬†and you'll be able to check on the status
  • Need to track your package?¬†Please email us if you haven't received the automatic tracking email.
  • Please make sure you check the¬†FAQ section¬†to make sure your question isn't already answered there
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468 Papanui Road, Papanui, Christchurch 8053

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We take pride in our quality and service


Stacey Watson


Just one word about the build quality of my Bike : Excellent - nothing more to say!

Wilfred Pratt


Exceptional quality and fast shipping. Just what I was looking for.

Erin James


Kevin & His Team were very helpful with my purchase recently.

Mabel Parker

Interior Designer

I already had high expectations based on my previous purchases, but I am still above satisfied!