SKU: 82976441894

Profile Design - Sonic Ergo 43a Wrist Relief

Sale price$142.34 Regular price$158.16
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Ships within 48 hours · Estimated delivery Aug 29 - Sep 3

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Description

Profile Design - Sonic Ergo 43a Wrist ReliefPROFILE DESIGN SONIC ERGO 43A 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

PROFILE DESIGN - SONIC ERGO 43A

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 – making it simple to fine tune a rider's position or match the position from their previous aerobar or bike.

Extensions

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 Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 82976441894

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Todd
Charlottesville, US
★★★★★ 5
5 star
Size: XX-Large, Color: Butter
Great product with great cost
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Reviewed in the United States on May 4, 2026
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Elizabeth
Omaha, US
★★★★★ 4
Beware the shrinkage
Size: X-Large, Color: Chill
This shirt came looking as expected and the quality was good but it ran a bit small. I had to give it to my dad and it looks great on him!
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Reviewed in the United States on September 1, 2025
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JAVIER MAURICIO RODRIGUEZ QUINTERO
Natrona Heights, US
★★★★★ 5
SATISFECHO
Size: Large, Color: Dark Heather
MUY BACANA
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Reviewed in the United States on June 5, 2026
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Morgan
Chelsea, US
★★★★★ 1
NOT EVEN CLOSE ON SIZE!!
Size: XX-Large, Color: Light Blue
I'm not a small guy...im rather robust like a good Italian dressing..and this shirt is 100% disproportionately wrong! If your thinking 3xl sounds good for the price DONT BUY IT!! At best this is an XL t-shirt with a 3XL tag. I can't return it because I immediately cut tags off my shirts..I know weird right lol. Anyway hopefully you read this and like ex-relationships you 'MOVE-ON'!!!!!
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Reviewed in the United States on May 4, 2026
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Danny
Draper, US
★★★★★ 5
Great!
Size: Medium, Color: Butter
Great!!!! Great price, fit, soft, durable. Didn’t shrink regular wash. Durable mid weight
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Reviewed in the United States on February 24, 2026

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