PRSNC391
723660011482
The Sonic / Ergo / Aerobar 39a Black is available at the following locations.
The item will be transferred to the location you choose during checkout.
If the item is not currently available to view at your desired location, please call your nearest store to arrange for it to be transferred.
The Sonic bracket offers an extensive fit range, low weight and easy adjustment along with minimal frontal area. Combining this with the Ergo armrest creates an aerobar that will aid most riders in optimizing their position for both speed and comfort.
The 39A is one of the newest versions of our reliable aluminium extension range.
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. Despite a fairly minimalist appearance, the Sonic/Ergo offers a comprehensive fit range for exactly this purpose.
The 39a extensions have a 39° grip angle. The rider can choose whether to hold high for the shrugged position or low for a more open, head-up position.
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. This is the most adjustable clip-on bar on the market (and in history).
It is worth noting that our previous top level clip-on aerobar, the J4/F35, offered 90 possible configurations. This highlights the significant step forward we?ve made with our new generation aerobars in allowing riders to precisely adjust their position.
After we released the Supersonic (J5) as a premium bracket with market-leading fit options and versatility, we wanted to bring the same kind of options to the rest of our range of brackets and thus aerobars.
By simplifying the extension clamp and shifting the wing forward to the bar centerline we were able to meet our targets. As a consequence of the simplification, the Sonic is the lightest of our current brackets.
The Ergo armrest shares the flippable design of the rest of our 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.
At ONIT Sports, we aren't just a retailer; we’re a hub for the South Wales cycling and triathlon community. As a leading independent cycle specialist in South Wales, we know that the right bike isn't just about the specs - it’s about how it feels on the road, the trail, or in a TT. Whether you’re visiting us in-store or browsing online, you’re getting advice from people who live and breathe life on two wheels.
Every bike that leaves our hands is professionally assembled and safety-checked by our fully trained technicians. We don’t just "box" bikes; we prepare them so that they arrive at your door, set-up and ready for the first mile.
We offer fast, secure UK shipping on all bikes. For that extra touch of care, we also provide a FREE bike fit on bikes collected in store - ensuring your new pride and joy is setup for you, ready for your first ride.
We believe top-tier performance should be accessible. We offer a range of flexible finance solutions through Novuna Personal Finance, as well as PayPal options, allowing you to spread the cost with a plan that suits your budget
Looking to save on your next ride? We proudly accept a wide range of Cycle Scheme vouchers, helping you make the most of tax-free cycling benefits with zero hassle.
Start your cycling journey with On It Sports, and hit the road with the total confidence that only expert-level support can provide.
| Colours | Black |
| Sizes | 39a, 52a |
| Brand | Profile Design |
| Model Year | 2026 |
| Barcodes | 723660011482, 723660011499 |
| SKUs / Part Numbers | PRSNC391, PRSNC521 |
