Profile Design Sonic/Ergo Aerobar — 52a 400mm aluminium extensions, 52° grip, anodized black

The Profile Design Sonic/Ergo/52a Aerobar is a lightweight, highly adjustable aluminium extension system that pairs the Sonic bracket with Ergo armrests to help cyclists fine-tune an aero and comfortable time-trial or triathlon position.

Profile Design built this aerobar to combine a broad fit range, simple on-bike adjustment and low frontal area so riders can pursue speed without sacrificing comfort. The 52a generation updates the reliable Sonic aluminium extensions with a 52° grip angle and long 400mm tubes, while the Ergo armrests include 10mm pads for cushioning. Finished in anodized black and weighing just 564 g, the unit is compatible with many base bars and suits riders who want durable aluminium performance at a practical price point.

How does the Sonic bracket improve fit for different riders?

The Sonic bracket offers an extensive fit range and straightforward adjustment points so you can dial in armrest width and extension position quickly. Its design minimizes frontal area while allowing increments fine enough to suit various shoulder widths and torso lengths.

• Width adjusts from 124 mm to 290 mm in 18.5 mm steps for wide fit coverage
• Simple clamp hardware for tool-assisted micro-adjustments
• Aluminium construction balances rigidity and low weight
• Works with common base bars found on triathlon and time-trial bikes

What comfort features do the Ergo armrests provide?

The Ergo armrests are shaped to support the forearms naturally while the 10 mm pads give a degree of cushioning without adding bulk. Their profile encourages a stable contact point for longer efforts and reduces pressure hotspots compared with flat supports.

• Ergo-shaped armrests for improved forearm contact and stability
• 10 mm pads for balanced cushioning and tactile feedback
• Pad material chosen for durability and sweat resistance
• Mounting allows small fore/aft and lateral tweaks for comfort tuning

How do the 52° grip angle and 400 mm extensions affect riding position?

The 52° grip angle promotes an aerodynamic wrist and hand alignment that many riders find comfortable for sustained time-trial and triathlon efforts. The 400 mm extension length provides ample reach options so athletes can set a stretched or compact position depending on frame geometry and flexibility.

• 52° grip angle supports aero wrist alignment for reduced drag
• 400 mm extension length offers broad reach range for varied setups
• Aluminium tubes maintain stiffness for predictable handling under power
• Angle and length combinations help balance aerodynamics and control

What are the practical specs and installation considerations?

The Sonic/Ergo/52a assembly is engineered to be a straightforward upgrade or replacement for many aluminium extension systems. At 564 g and anodized black finish, it fits a range of frames and will require compatible clamp diameter and clearance behind the base bar.

• Weight: 564 g for the complete assembly (bracket, armrests, extensions)
• Color: anodized black for corrosion resistance and a low-glare look
• Width range: 124–290 mm with 18.5 mm stepping for repeatable setup
• Extension tubes: 400 mm length, 52° grip angle, aluminium 52a series

Who is this for: The Profile Design Sonic/Ergo/52a Aerobar is aimed at triathletes and time-trial riders who need a versatile, lightweight aluminium extension system with a wide fit range. It suits athletes upgrading from stock aerobars, racers seeking a durable and adjustable set for training and events, and fitters who require repeatable adjustment steps to tune rider position without moving to carbon extensions.